Optimal regularity and control of the support for the pullback equation
|
|
- Damon Ross
- 5 years ago
- Views:
Transcription
1 Optimal regularity and control of the support for the pullback equation O. KNEUSS Department of Mathematics, Federal University of Rio de Janeiro Rio de Janeiro, Brazil August 14, 2017 Abstract Given f, g two C r,α either symplectic forms or volume forms on a bounded open set R n with 0 < α < 1 and r 0, we give natural conditions for the existence of a map ϕ Diff r+1,α (; ) satisfying ϕ (g) = f in and supp(ϕ id). 1 Introduction The pullback equation ϕ (g) = f where g and f are both symplectic forms or both volume forms has been studied a lot. One could consult [5] for an extensive survey for the pullback equation in general. We start by giving a very brief summary for the symplectic case: Darboux [8] proved that any two symplectic forms can be pulled back locally one to another. This result has been reproved by Moser [11] using an elegant flow method. These two proofs do not produce any gain in regularity: the map ϕ is at most as regular as the data g and f. Later Bandyopadhyay-Dacorogna [2] established in particular in a local existence result with optimal regularity in the Hölder spaces C r,α, 0 < α < 1. Since the pullback equation is a system of first order PDE s, optimality means here that for g, f C r,α there exists a solution ϕ C r+1,α. For the global case coupled with a Dirichlet condition, ϕ (g) = f in and ϕ = id on (1) the following (quasi) optimal result has been proved in [6] (see also [2] for a slightly weaker result): given ω C r,α ([0, 1] ; Λ 2 ) an homotopy of symplectic forms between g and f such that, for every t [0, 1], ω t ω 0 is exact in and ω t ν = ω 0 ν C r+1,α ( ; Λ 3 ) 1
2 then there exists ϕ Diff r+1,α (; ) solving (1), where ν denotes the outward unit normal of some smooth bounded open set and is identified with a 1 form. Note that, for a solution to (1) to exist, we necessarily have g ν = f ν on. Note also that the only non natural condition (whose necessity is still an open problem) is the extra regularity of ω t ν on the boundary. Concerning the case of volume forms (in which case, identifying volume forms with functions, ϕ (g) = f reads as the single equation g(ϕ) det ϕ = f) the first existence result (with no gain in regularity) for (1) is due to Moser [11]. Afterwards Dacorogna and Moser proved in [7] that given any g, f C r,α () strictly positive where is a smooth connected bounded open set with g = f, (2) there exists ϕ Diff r+1,α (; ) satisfying (1). Note that (2) is obviously necessary to solve (1). Other proofs of this optimal regularity result have been established in [1], [4] and [13]. In this paper we give conditions to solve the pullback equation ϕ (g) = f in with optimal regularity in Hölder space and imposing that ϕ = id near the boundary (and not only on as in (1)). An obvious necessary condition for this problem is then supp(g f). (3) We prove (cf. Theorems 1 and 3) that the above condition is to some extent also sufficient: Theorem. (i) given a bounded open set in R n star-shaped with respect with some open ball and ω a continuous homotopy of C r,α (; Λ 2 ) symplectic forms between g and f such that supp(ω t f) for every t [0, 1], there exists ϕ Diff r+1,α (; ) verifying ϕ (g) = f in and supp(ϕ id). (4) (ii) given g, f two non vanishing C r,α () functions in some bounded connected open set verifying (2) and (3), there exists ϕ Diff r+1,α (; ) verifying (4). Note that, in the symplectic case, we no longer need the extra regularity of ω t ν on the boundary as mentioned above to solve (1). For another proof of the above result for volume forms (Theorem 3) but with the additional constraint g 1 see [12] and for a proof of Theorem 3 in the annulus one can also consult [10]. 2
3 The proofs of Theorems 1 and 3 follow similar arguments as in [2] and [6] : we exhibit an appropriate smoothing of f, resp. g, denoted f ɛ, resp. g ɛ, show that we can pullback with optimal regularity f ɛ to f with ϕ 1 as well as g ɛ to g with ϕ 2 and then, by the usual flow method g ɛ to f ɛ with ϕ 3. The desired solution is then ϕ = (ϕ 2 ) 1 ϕ 3 ϕ 1. To ensure that supp(ϕ id) we additionally first enforce that supp(f ɛ g ɛ ) and, afterwards, that supp(ϕ 1 ϕ 2 ) and ϕ 3 = id near ϕ 1 ( ) = ϕ 2 ( ). Note that in [2] and [6] the condition ϕ = id on was done by imposing ϕ i = id on and thus, necessarily, f ν = f ɛ ν and g ν = g ɛ ν on leading to the extra regularity of the tangential parts of f and g on the boundary. Moreover in [2] and [6] the smoothing of f and g was done by convolution with a special kernel lacking compact support. In this paper we show that the convolution with any kernel with compact support (implying directly that supp(f ɛ g ɛ ) ) still produces an appropriate smoothing (cf. Lemma 5 and Remark 6). 2 Notation In this paper we use the following notation and refer to [5] for them. (i) The space C r,α (; Λ k ) with its norm C r,α (), where r 0, 0 α 1, 0 k n and is a bounded open set of R n, denotes the set of C r,α k forms in. When a k form ω depends on some parameter, i.e. ω C r,α ([0, 1] ; Λ k ) we will often use the notation ω(t, x) = ω t (x). (ii) The set Diff r,α (U; ), where U and are two bounded open set of R n, is the set of maps ϕ such that ϕ C r,α (U; ) and, ϕ 1 C r,α (; U) (iii) A set is said to be star-shaped with respect to a set W if for every x and y W the segment [x, y] := {(1 t)x + ty : t [0, 1]} is contained in. (iv) The usual exterior product is denoted by. The interior product of a k form g, with a vector field u is the (k 1)-form denoted by u g. The exterior differential of a k form g is the (k + 1)-for denoted by dg. The coexterior differential of a k form g is the (k 1)-form denoted by δg. A k form g is said to be closed, resp. co-closed in if dg = 0, resp. δg = 0, in. The set H(; Λ k ) denotes the sets of closed and co-closed k forms in. (v) Let ω C 0 (; Λ 2 ). The map ω C 0 (; R n n ) is defined by (where the index below denotes the column and the index above the row) (ω) j i = ω ij where we have used again the convention ω ij = ω ji. Hence for every x the matrix ω(x) R n n is skew-symmetric and thus its rank is even. Note that, for a vector field u, u ω = ω u. When the rank of ω is equal to n (the dimension of ) we have, for vector fields u and v, v = u ω u = (ω) 1 v. (5) 3
4 A 2 form ω is called symplectic in if dω = 0 and if rank(ω) = n in. (vi) For a k form g defined in and a C 1 map ϕ : U the pullback of g by ϕ is the k form defined in U denoted by ϕ (g). One will constantly use the following property for the pullback 3 Main results We now state our two main results. (ϕ ψ) (g) = ψ (ϕ (g)). (6) Theorem 1. Let R n be a bounded open set star-shaped with respect to some open ball, r 0 and 0 < α < 1. Let f and g be two C r,α symplectic forms in such that there exists ω C 0 ([0, 1] ; Λ 2 ) verifying, for every t [0, 1], ω t is a C r,α symplectic form in, supp(ω t ω 0 ) and ω 0 = f, ω 1 = g. Then there exists ϕ Diff r+1,α (; ) such that ϕ (g) = f and supp(ϕ id). Remark 2. Theorem 1 can be extended (with exactly the same proof) to any bounded open set assuming additionally that the homotopy ω t is such that there exists, for every t [0, 1], F t Cc r+1,α (, Λ 1 ) with df t = ω t ω 0 in. Note that the above property is automatically satisfied as soon as is star-shaped with respect with some open ball (cf. Proposition 7). Theorem 3. Let R n be a bounded connected open set, r 0 and 0 < α < 1. Let f, g C r,α () be such that f g > 0 in, f = g and supp(g f). Then there exists ϕ Diff r+1,α (; ) such that ϕ (g) = f and supp(ϕ id). 4
5 4 Intermediary results We start be recalling some classical results concerning Hölder spaces. proof see e.g. Theorems 16.26, and Corollary 16.25, in [5]. For a Theorem 4. Let R n be a bounded open set with Lipschitz boundary. Let r 0 and 0 α 1. The following four assertions are then verified. (i) [Product] There exists a constant C = C(r, ) such that for every f, g C r,α (), ) fg C r,α () ( f C C r,α () g C 0 () + f C 0 () g C r,α (). (ii) [Division] Let A C r,α (; R n n ) and c > 0 be such that 1, A det A C0 () c. C0 () Then there exists a constant C = C(c, r, ) such that A 1 C r,α () C A C r,α (). (iii) [Interpolation] There exists a constant C = C(s, ) such for every integers s, t and every 0 β, γ 1 with one has where λ [0, 1] is such that t + γ r + α s + β f C r,α () C f λ C t,γ () f 1 λ C s,β () λ(t + γ) + (1 λ)(s + β) = r + α. (iv) [Equivalence of norms] The norms C r,α () and C 0 () +[ r ] C 0,α () are equivalent. We next give some elementary estimates for the usual smoothing by convolution of a function. Although these estimates are essentially contained in Theorem in [5] (see also Remark 6) we reprove them for the convenience of the reader. Lemma 5. Let, U R n be two bounded open sets with Lipschitz boundary such that U Let r 1, 0 α 1 and ρ C c (R n ) be such that R n ρ = 1. Then, for every f C r,α (U) and every ɛ small enough, f ɛ C (U) defined by where ρ ɛ ( ) = 1/ɛ n ρ( /ɛ), satisfies f ɛ = f ρ ɛ, ɛ f ɛ C 0 () C f C 1 (U) (7) 5
6 and, for every 0 γ 1, f ɛ C r+1,γ (), ɛf ɛ C r,γ () where C is a constant depending only on r, ρ and U. C ɛ 1+γ α f C r,α (U), (8) Remark 6. Note that in Theorem in [5] we obtained a wider range of estimates but for that we had to use a specific kernel which does not have compact support. The compactness of the support of the smoothing kernel will be crucial in the proofs of Theorems 1 and 3. Proof. First since ρ has compact support it is obvious that f ɛ is well defined and C in for any ɛ small enough. Moreover an elementary calculation gives (7). In what follows C will denote a generic constant depending only on r, ρ and U that may change from appearance to appearance. Step 1. We prove the first inequality in (8). First, a direct caculation gives that, for any integer t and any 0 δ 1 with t + δ r + α, f ɛ C t,δ () C f C r,α (U). (9) Next, since 2 f ɛ = 1 ɛ 2 f ( 2 ρ) ɛ we get that (as in (9)) 2 f ɛ C r,α () C ɛ 2 f C r,α (U). Thus, combining the previous inequality and (9) for t = δ = 0 with Theorem 4 (iv), we get f ɛ C r+2,α () C ɛ 2 f C r,α (U). Finally, using the previous inequality, (9) with t = r and δ = α and Theorem 4 (iii), we get where λ is such that f ɛ C r+1,γ () C f ɛ λ C r+2,α () f ɛ 1 λ C r,α () C ɛ 2λ f C r,α (U) = C ɛ 1+γ α f C r,α (U), This proves the first part of (8). λ(r α) + (1 λ)(r + α) = r γ. Step 2. We prove the second inequality in (8). Note that ɛ f ɛ = 1 ɛ f η ɛ where η(z) = nρ(z) + z; ρ(z). 6
7 For γ α we hence have, proceeding exactly as in Step 1, ɛ f ɛ C r,γ () = 1 ɛ f η ɛ C r,γ () C ɛ 1+γ α f C r,α (U). (10) It hence only remains to prove the second inequality in (8) for γ < α. First, noticing that η = 0, we have R n r ɛ f ɛ (x) = 1 ɛ r f η ɛ (x) = 1 η(y) [ r f(x ɛy) f(x)] dy, ɛ R n which yields to r ɛ f ɛ C0 () ɛα 1 f C r,α (U). Hence, combining the previous inequality and (10) with Theorem 4 (iii) we get r ɛ f ɛ C 0,γ () C r ɛ f ɛ λ C 0 () r ɛ f ɛ 1 λ C 0,α () C ɛ f (1 α)λ+1 λ C r,α (U) = C ɛ 1+γ α f C r,α (U), where λ is such that (1 λ)α = γ. Combining the previous inequality with (7) we get (8) by Theorem 4 (iv). We now give a version of Poincaré Lemma with optimal regularity for forms with compact support. This result is an extension of a result of Bogovski [3] (see also [9]) for the divergence operator and is essentially contained in [14]. Proposition 7. Let r 0, 0 < α < 1, 1 k n and R n be a bounded open connected set additionally assumed to be star-shaped with respect to some open ball when 1 k < n. Then for every f Cc r,α (; Λ k ) such that { df = 0 in if k < n f = 0 if k = n there exists F Cc r+1,α (; Λ k 1 ) with df = f in. Remark 8. Note that the result is false in general (even without the gain in regularity) in the case 1 k < n when is not star-shaped with respect to some open ball. We give an example of this fact when k = 1 and when = {x R n : 1/2 < x < 1}: taking ω = dg where G is any smooth function being 1 near { x = 1/2} and 0 near { x = 1}, it does not exist a function F with compact support in and with df = ω. Indeed, if such a function existed, one would get, integrating by parts, 0 = df = dg 0, a contradiction. 7
8 Proof. For the proof of the result when k = n we refer to [3] (see also e.g. [9]). For the case k < n we refer to [14] where an explicit formula for F is given. Note that [14] deals with Sobolev spaces but exactly the same proof (involving Calderon-Zygmund singular operator theory) works for Hölder spaces. We finally recall a regularity result for the flow essentially due to Rivière-Ye [13], see also Theorem 12.4 in [5]. Proposition 9. Let r 0 and 0 < α < 1. Let R n be a bounded open set with Lipschitz boundary, η, c > 0 and be such that for every ɛ (0, η] u ɛ C r+1,γ () u C ((0, η] ; R n ) c ɛ 1+γ α for every γ [0, 1]. Let U be a smooth open set such that U. Then for any ɛ small enough the solution ϕ ɛ of ɛ ϕ ɛ = u ɛ ϕ ɛ and ϕ 0 = id. exists in U with ϕ ɛ (U) and ϕ ɛ Diff r+1,α (U; ϕ ɛ ()). Remark 10. Note that, since u ɛ C r+1,γ L 1 (0, η) for any γ < α, then by classical results we directly have that ϕ ɛ Diff r+1,γ. The above proposition asserts that ϕ ɛ Diff r+1,α making use of the special estimate on u ɛ. 5 Proof of the main results We are now in position to prove Theorems 1 and 3. Proof of Theorem 1. Step 1 (simplification). First, taking slightly smaller we can assume that ω is continuous in [0, 1] and that ω t is symplectic and C r,α in for every t [0, 1]. Moreover we can assume that the homotopy ω is linear, i.e. ω t = (1 t)f + tg. Indeed by continuity of ω there exists an integer M big enough so that, for every 1 i M and every t [0, 1], (1 t)ω (i 1)/M + tω i/m is symplectic in. Since (by (6)) to pullback g to f it is sufficient to pullback ω i/m to ω (i 1)/M for every 1 i M we have the claim. Step 2 (smoothing of ω t ). By Theorem 6.12 in [5] we know that, recalling that df = 0, f = da + h 8
9 where a C r+1,α (; Λ 1 ) and h H(; Λ 2 ) C (; Λ 2 ) (cf. e.g. Theorem 6.3 in [5] for the previous inclusion). By Proposition 7 there exist b Cc r+1,α (, Λ 1 ) such that db = g f in. Let ρ Cc (R n ) be such that ρ = 1. For every ɛ small enough, taking R n slightly smaller, define a ɛ C (; Λ 1 ) and b ɛ Cc (; Λ 1 ) as a ɛ = a ρ ɛ and b ɛ = b ρ ɛ and thus, appealing to Lemma 5, for every ɛ small enough and every γ [0, 1], and a ɛ C r+2,γ () + bɛ C r+2,γ () ɛ a ɛ C r+1,γ () + ɛb ɛ C r+1,γ () c ɛ 1+γ α (11) c ɛ 1+γ α (12) ɛ a ɛ C0 () + ɛb ɛ C0 () c, (13) where c is a constant independent of ɛ. Finally, for every t [0, 1] and ɛ small enough, define ω ɛ t C (; Λ 2 ) by ω ɛ t = da ɛ + h + tdb ɛ. Since ω 0 t = ω t it is clear that ω ɛ t is symplectic in for any ɛ small enough. Step 3 (estimate). Define, for every ɛ small enough and t [0, 1], u ɛ t C (; R n ) by (see (5)) u ɛ t = (ω ɛ t) 1 ɛ [a ɛ + tb ɛ ] d(u ɛ t ω ɛ t) = ɛ ω ɛ t. (14) We claim that there exists a constant c independent of ɛ and t such that u ɛ t C r+1,γ () c ɛ 1+γ α for every ɛ small enough and every 0 γ 1. (15) In what follows c will denote a generic constant independent of ɛ and t that may change from appearance to appearance. Using Theorem 4 (i),(ii) as well as (11), (12) and (13), we obtain u ɛ t C r+1,γ () c ɛ a ɛ + ɛ b ɛ C r+1,γ () (ωɛ t) 1 C 0 () + c ɛa ɛ + ɛ b ɛ C 0 () (ωɛ t) 1 C r+1,γ () c ɛ 1+γ α + c ωɛ t C r+1,γ () c ɛ 1+γ α + c daɛ + h + tdb ɛ C r+1,γ () c ɛ 1+γ α + c aɛ C r+2,γ () + c bɛ C r+2,γ () c ɛ 1+γ α, showing the claim. 9
10 Step 4. (pulling back ω ɛ 0 to ω 0 = f and ω ɛ 1 to ω 1 = g). Let 1 and 2 be smooth open sets so that, for any ɛ small enough, supp(g f) supp b ɛ (16) By Proposition 9 and (15), the solution ϕ ɛ and ψ ɛ of ɛ ϕ ɛ = u ɛ 1 ϕ ɛ and ϕ 0 = id and ɛ ψ ɛ = u ɛ 0 ψ ɛ and ϕ 0 = id exists on 1 for ɛ small enough with ϕ ɛ ( 1 ) ϕ 1 ɛ ( 1 ) and ϕ ɛ Diff r+1,α ( 1 ; ϕ ɛ ( 1 )) as similarly for ψ ɛ. Moreover, by (16) and (14), we have supp(u ɛ 0 u ɛ 1) 2 for ɛ small enough. Hence, choosing ɛ smaller if necessary one deduce that as well as ϕ 1 ɛ = ψɛ 1 on 1 \ 2 and thus ϕ 1 ɛ ( 1 ) = ψɛ 1 ( 1 ) (17) 2 ϕ 1 ɛ ( 1 ). (18) Finally, using (14) we get that, by the classical flow method (see eg. Theorem 12.7 in [5]), (ϕ ɛ ) (ω ɛ 0) = f and (ψ ɛ ) (ω ɛ 1) = g in 1. (19) Step 5 (pulling back ω1 ɛ to ω0). ɛ For any ɛ small enough and t [0, 1] define vt ɛ Cc ( 3 ; R n ) by v ɛ t = (ω ɛ t) 1 u ɛ d(v ɛ t ω ɛ t) = t ω ɛ t. Again by the classical flow method we get that the solution φ t of t φ t = v t φ t and φ 0 = id satisfy, for every t [0, 1] φ t Diff (; ) and (φ t ) (ω ɛ t) = ω ɛ 0 in and supp(φ t id) 2. (20) Step 6 (conclusion). We claim that, for ɛ small enough, { ψ 1 ɛ φ ϕ = 1 ϕ ɛ in ϕ 1 ɛ ( 1 ) id in \ ϕ 1 ɛ ( 1 ) has all the wished properties. First, by (17) and since (combining (18) and (20)) we directly get that ψ 1 ɛ φ 1 (ϕ 1 ɛ ( 1 )) = ϕ 1 ɛ ( 1 ), φ 1 ϕ ɛ Diff r+1,α (ϕ 1 ɛ ( 1 ); ψɛ 1 ( 1 )) 10
11 Moreover combining (17), (18) and (20) we deduce that ψ 1 ɛ φ 1 ϕ ɛ is the identity near ϕ 1 ɛ ( 1 ) implying trivially that ϕ Diff r+1,α (; ). It only remains to show that ϕ pulls back g to f in. First, using (6), (19) and (20), we get that ψɛ 1 φ 1 ϕ ɛ pulls back g to f in ϕ 1 ɛ ( 1 ). Finally, recalling that (cf. (16) and (18)) we trivially have that supp(g f) 2 ϕ 1 ɛ ( 1 ), ϕ (g) = id (g) = f in \ ϕ 1 ɛ ( 1 ). This proves that ϕ pulls back g to f in and concludes the proof. Proof of Theorem 3. Since the proof of Theorem 3 is very similar to one of Theorem 1 we only briefly summarize it. Consider the linear homotopy ω t = (1 t)f + tg and consider its smoothing with respect to x ω ɛ t = λ ɛ t ω t ρ ɛ where ρ ɛ is as before and where λ ɛ t is so that ωt ɛ = f = We then proceed exactly as in the proof of Theorem 1 to conclude. g. References [1] Avinyó A., Solà-Morales J., and València M., A singular initial value problem to construct density-equalizing maps, Journal of Dynamics and Differential Equations, Vol. 24 (2012), [2] Bandyopadhyay S. and Dacorogna B., On the pullback equation ϕ(g) = f, Ann. Inst. H. Poincare Anal. Non Lineaire, Vol. 26 (2009), [3] Bogovski M.E., Solution of the first boundary value, problem for the equation of continuity of an incompressible medium, Soviet Math. Dokl., Vol. 20 (1979), [4] Carlier G. and Dacorogna B., Réesolution du problème de Dirichlet pour l équation du jacobien prescrit via l équation de Monge-Ampère, C. R. Math. Acad. Sci. Paris, Vol. 350 (2012), , [5] Csató G., Dacorogna B. and Kneuss O., The pullback equation for differential forms, Birkhäuser/Springer, New York,
12 [6] Dacorogna B. and Kneuss O., A global version of Darboux theorem with optimal regularity and Dirichlet condition, Advan. Differ. Eq., Vol. 16 (2011), [7] Dacorogna B. and Moser J., On a partial differential equation involving the Jacobian determinant, Ann. Inst. H. Poincare Anal. Non Lineaire, Vol. 7 (1990), [8] Darboux G., Sur le probl eme de Pfaff, Bull Sci.Math., Vol. 6 (1882), 14 36, [9] Galdi G., An Introduction to the Mathematical Theory of the Navier-Stokes Equations: Steady-state problems, Springer, New York, [10] Matheus C., blog. [11] Moser J., On the volume elements on a manifold, Trans. Amer. Math. Soc., Vol. 120 (1965), [12] Teixeira P., Dacorogna-Moser theorem with control of support, arxiv: [13] Rivière T. and Ye D., Resolutions of the prescribed volume form equation, Nonlinear Differ. Eq. Appl., Vol. 3 (1996), [14] Takahashi S., On the Poincaré-Bogovski lemma on differential forms, Proc. Japan Acad. Ser. A Math. Sci., Vol. 68 (1992),
A LOWER BOUND ON BLOWUP RATES FOR THE 3D INCOMPRESSIBLE EULER EQUATION AND A SINGLE EXPONENTIAL BEALE-KATO-MAJDA ESTIMATE. 1.
A LOWER BOUND ON BLOWUP RATES FOR THE 3D INCOMPRESSIBLE EULER EQUATION AND A SINGLE EXPONENTIAL BEALE-KATO-MAJDA ESTIMATE THOMAS CHEN AND NATAŠA PAVLOVIĆ Abstract. We prove a Beale-Kato-Majda criterion
More informationREMARKS ON THE VANISHING OBSTACLE LIMIT FOR A 3D VISCOUS INCOMPRESSIBLE FLUID
REMARKS ON THE VANISHING OBSTACLE LIMIT FOR A 3D VISCOUS INCOMPRESSIBLE FLUID DRAGOŞ IFTIMIE AND JAMES P. KELLIHER Abstract. In [Math. Ann. 336 (2006), 449-489] the authors consider the two dimensional
More informationOn Friedrichs inequality, Helmholtz decomposition, vector potentials, and the div-curl lemma. Ben Schweizer 1
On Friedrichs inequality, Helmholtz decomposition, vector potentials, and the div-curl lemma Ben Schweizer 1 January 16, 2017 Abstract: We study connections between four different types of results that
More informationEnergy method for wave equations
Energy method for wave equations Willie Wong Based on commit 5dfb7e5 of 2017-11-06 13:29 Abstract We give an elementary discussion of the energy method (and particularly the vector field method) in the
More informationThe oblique derivative problem for general elliptic systems in Lipschitz domains
M. MITREA The oblique derivative problem for general elliptic systems in Lipschitz domains Let M be a smooth, oriented, connected, compact, boundaryless manifold of real dimension m, and let T M and T
More informationSYMMETRY RESULTS FOR PERTURBED PROBLEMS AND RELATED QUESTIONS. Massimo Grosi Filomena Pacella S. L. Yadava. 1. Introduction
Topological Methods in Nonlinear Analysis Journal of the Juliusz Schauder Center Volume 21, 2003, 211 226 SYMMETRY RESULTS FOR PERTURBED PROBLEMS AND RELATED QUESTIONS Massimo Grosi Filomena Pacella S.
More informationABSOLUTE CONTINUITY OF FOLIATIONS
ABSOLUTE CONTINUITY OF FOLIATIONS C. PUGH, M. VIANA, A. WILKINSON 1. Introduction In what follows, U is an open neighborhood in a compact Riemannian manifold M, and F is a local foliation of U. By this
More informationESTIMATES FOR ELLIPTIC HOMOGENIZATION PROBLEMS IN NONSMOOTH DOMAINS. Zhongwei Shen
W,p ESTIMATES FOR ELLIPTIC HOMOGENIZATION PROBLEMS IN NONSMOOTH DOMAINS Zhongwei Shen Abstract. Let L = div`a` x, > be a family of second order elliptic operators with real, symmetric coefficients on a
More informationMinimization problems on the Hardy-Sobolev inequality
manuscript No. (will be inserted by the editor) Minimization problems on the Hardy-Sobolev inequality Masato Hashizume Received: date / Accepted: date Abstract We study minimization problems on Hardy-Sobolev
More informationMATH 4030 Differential Geometry Lecture Notes Part 4 last revised on December 4, Elementary tensor calculus
MATH 4030 Differential Geometry Lecture Notes Part 4 last revised on December 4, 205 Elementary tensor calculus We will study in this section some basic multilinear algebra and operations on tensors. Let
More informationHomogenization and error estimates of free boundary velocities in periodic media
Homogenization and error estimates of free boundary velocities in periodic media Inwon C. Kim October 7, 2011 Abstract In this note I describe a recent result ([14]-[15]) on homogenization and error estimates
More informationR. M. Brown. 29 March 2008 / Regional AMS meeting in Baton Rouge. Department of Mathematics University of Kentucky. The mixed problem.
mixed R. M. Department of Mathematics University of Kentucky 29 March 2008 / Regional AMS meeting in Baton Rouge Outline mixed 1 mixed 2 3 4 mixed We consider the mixed boundary value Lu = 0 u = f D u
More informationLaplace s Equation. Chapter Mean Value Formulas
Chapter 1 Laplace s Equation Let be an open set in R n. A function u C 2 () is called harmonic in if it satisfies Laplace s equation n (1.1) u := D ii u = 0 in. i=1 A function u C 2 () is called subharmonic
More informationThe Dirichlet s P rinciple. In this lecture we discuss an alternative formulation of the Dirichlet problem for the Laplace equation:
Oct. 1 The Dirichlet s P rinciple In this lecture we discuss an alternative formulation of the Dirichlet problem for the Laplace equation: 1. Dirichlet s Principle. u = in, u = g on. ( 1 ) If we multiply
More informationarxiv: v1 [math.ap] 21 Dec 2016
arxiv:1612.07051v1 [math.ap] 21 Dec 2016 On the extension to slip boundary conditions of a Bae and Choe regularity criterion for the Navier-Stokes equations. The half-space case. H. Beirão da Veiga, Department
More informationarxiv: v1 [math.fa] 26 Jan 2017
WEAK APPROXIMATION BY BOUNDED SOBOLEV MAPS WITH VALUES INTO COMPLETE MANIFOLDS PIERRE BOUSQUET, AUGUSTO C. PONCE, AND JEAN VAN SCHAFTINGEN arxiv:1701.07627v1 [math.fa] 26 Jan 2017 Abstract. We have recently
More informationMath 225B: Differential Geometry, Final
Math 225B: Differential Geometry, Final Ian Coley March 5, 204 Problem Spring 20,. Show that if X is a smooth vector field on a (smooth) manifold of dimension n and if X p is nonzero for some point of
More informationON THE DEFORMATION WITH CONSTANT MILNOR NUMBER AND NEWTON POLYHEDRON
ON THE DEFORMATION WITH CONSTANT MILNOR NUMBER AND NEWTON POLYHEDRON OULD M ABDERRAHMANE Abstract- We show that every µ-constant family of isolated hypersurface singularities satisfying a nondegeneracy
More informationHofer s Proof of the Weinstein Conjecture for Overtwisted Contact Structures Julian Chaidez
Hofer s Proof of the Weinstein Conjecture for Overtwisted Contact Structures Julian Chaidez 1 Introduction In this paper, we will be discussing a question about contact manifolds, so let s start by defining
More informationSHARP BOUNDARY TRACE INEQUALITIES. 1. Introduction
SHARP BOUNDARY TRACE INEQUALITIES GILES AUCHMUTY Abstract. This paper describes sharp inequalities for the trace of Sobolev functions on the boundary of a bounded region R N. The inequalities bound (semi-)norms
More informationDissipative quasi-geostrophic equations with L p data
Electronic Journal of Differential Equations, Vol. (), No. 56, pp. 3. ISSN: 7-669. URL: http://ejde.math.swt.edu or http://ejde.math.unt.edu ftp ejde.math.swt.edu (login: ftp) Dissipative quasi-geostrophic
More informationExtension and Representation of Divergence-free Vector Fields on Bounded Domains. Tosio Kato, Marius Mitrea, Gustavo Ponce, and Michael Taylor
Extension and Representation of Divergence-free Vector Fields on Bounded Domains Tosio Kato, Marius Mitrea, Gustavo Ponce, and Michael Taylor 1. Introduction Let Ω R n be a bounded, connected domain, with
More informationATTRACTORS FOR SEMILINEAR PARABOLIC PROBLEMS WITH DIRICHLET BOUNDARY CONDITIONS IN VARYING DOMAINS. Emerson A. M. de Abreu Alexandre N.
ATTRACTORS FOR SEMILINEAR PARABOLIC PROBLEMS WITH DIRICHLET BOUNDARY CONDITIONS IN VARYING DOMAINS Emerson A. M. de Abreu Alexandre N. Carvalho Abstract Under fairly general conditions one can prove that
More informationOn the Ladyzhenskaya Smagorinsky turbulence model of the Navier Stokes equations in smooth domains. The regularity problem
J. Eur. Math. Soc. 11, 127 167 c European Mathematical Society 2009 H. Beirão da Veiga On the Ladyzhenskaya Smagorinsky turbulence model of the Navier Stokes equations in smooth domains. The regularity
More informationEXISTENCE AND REGULARITY OF SOLUTIONS FOR STOKES SYSTEMS WITH NON-SMOOTH BOUNDARY DATA IN A POLYHEDRON
Electronic Journal of Differential Equations, Vol. 2017 (2017), No. 147, pp. 1 10. ISSN: 1072-6691. URL: http://ejde.math.txstate.edu or http://ejde.math.unt.edu EXISTENCE AND REGULARITY OF SOLUTIONS FOR
More informationGRAND SOBOLEV SPACES AND THEIR APPLICATIONS TO VARIATIONAL PROBLEMS
LE MATEMATICHE Vol. LI (1996) Fasc. II, pp. 335347 GRAND SOBOLEV SPACES AND THEIR APPLICATIONS TO VARIATIONAL PROBLEMS CARLO SBORDONE Dedicated to Professor Francesco Guglielmino on his 7th birthday W
More informationA Remark on the Regularity of Solutions of Maxwell s Equations on Lipschitz Domains
A Remark on the Regularity of Solutions of Maxwell s Equations on Lipschitz Domains Martin Costabel Abstract Let u be a vector field on a bounded Lipschitz domain in R 3, and let u together with its divergence
More informationOn the local existence for an active scalar equation in critical regularity setting
On the local existence for an active scalar equation in critical regularity setting Walter Rusin Department of Mathematics, Oklahoma State University, Stillwater, OK 7478 Fei Wang Department of Mathematics,
More informationPiecewise Smooth Solutions to the Burgers-Hilbert Equation
Piecewise Smooth Solutions to the Burgers-Hilbert Equation Alberto Bressan and Tianyou Zhang Department of Mathematics, Penn State University, University Park, Pa 68, USA e-mails: bressan@mathpsuedu, zhang
More informationINSTITUTE OF MATHEMATICS THE CZECH ACADEMY OF SCIENCES. Note on the fast decay property of steady Navier-Stokes flows in the whole space
INSTITUTE OF MATHEMATICS THE CZECH ACADEMY OF SCIENCES Note on the fast decay property of stea Navier-Stokes flows in the whole space Tomoyuki Nakatsuka Preprint No. 15-017 PRAHA 017 Note on the fast
More information2 A Model, Harmonic Map, Problem
ELLIPTIC SYSTEMS JOHN E. HUTCHINSON Department of Mathematics School of Mathematical Sciences, A.N.U. 1 Introduction Elliptic equations model the behaviour of scalar quantities u, such as temperature or
More informationTwo dimensional exterior mixed problem for semilinear damped wave equations
J. Math. Anal. Appl. 31 (25) 366 377 www.elsevier.com/locate/jmaa Two dimensional exterior mixed problem for semilinear damped wave equations Ryo Ikehata 1 Department of Mathematics, Graduate School of
More informationALGEBRAIC HYPERBOLICITY OF THE VERY GENERAL QUINTIC SURFACE IN P 3
ALGEBRAIC HYPERBOLICITY OF THE VERY GENERAL QUINTIC SURFACE IN P 3 IZZET COSKUN AND ERIC RIEDL Abstract. We prove that a curve of degree dk on a very general surface of degree d 5 in P 3 has geometric
More informationASYMPTOTIC STRUCTURE FOR SOLUTIONS OF THE NAVIER STOKES EQUATIONS. Tian Ma. Shouhong Wang
DISCRETE AND CONTINUOUS Website: http://aimsciences.org DYNAMICAL SYSTEMS Volume 11, Number 1, July 004 pp. 189 04 ASYMPTOTIC STRUCTURE FOR SOLUTIONS OF THE NAVIER STOKES EQUATIONS Tian Ma Department of
More informationSOLUTION TO RUBEL S QUESTION ABOUT DIFFERENTIALLY ALGEBRAIC DEPENDENCE ON INITIAL VALUES GUY KATRIEL PREPRINT NO /4
SOLUTION TO RUBEL S QUESTION ABOUT DIFFERENTIALLY ALGEBRAIC DEPENDENCE ON INITIAL VALUES GUY KATRIEL PREPRINT NO. 2 2003/4 1 SOLUTION TO RUBEL S QUESTION ABOUT DIFFERENTIALLY ALGEBRAIC DEPENDENCE ON INITIAL
More informationWeighted norm inequalities for singular integral operators
Weighted norm inequalities for singular integral operators C. Pérez Journal of the London mathematical society 49 (994), 296 308. Departmento de Matemáticas Universidad Autónoma de Madrid 28049 Madrid,
More informationIntroduction to finite element exterior calculus
Introduction to finite element exterior calculus Ragnar Winther CMA, University of Oslo Norway Why finite element exterior calculus? Recall the de Rham complex on the form: R H 1 (Ω) grad H(curl, Ω) curl
More informationON SOME ELLIPTIC PROBLEMS IN UNBOUNDED DOMAINS
Chin. Ann. Math.??B(?), 200?, 1 20 DOI: 10.1007/s11401-007-0001-x ON SOME ELLIPTIC PROBLEMS IN UNBOUNDED DOMAINS Michel CHIPOT Abstract We present a method allowing to obtain existence of a solution for
More informationREGULARITY OF GENERALIZED NAVEIR-STOKES EQUATIONS IN TERMS OF DIRECTION OF THE VELOCITY
Electronic Journal of Differential Equations, Vol. 00(00), No. 05, pp. 5. ISSN: 07-669. UR: http://ejde.math.txstate.edu or http://ejde.math.unt.edu ftp ejde.math.txstate.edu REGUARITY OF GENERAIZED NAVEIR-STOKES
More informationComplex geometrical optics solutions for Lipschitz conductivities
Rev. Mat. Iberoamericana 19 (2003), 57 72 Complex geometrical optics solutions for Lipschitz conductivities Lassi Päivärinta, Alexander Panchenko and Gunther Uhlmann Abstract We prove the existence of
More informationA Caffarelli-Kohn-Nirenberg type inequality with variable exponent and applications to PDE s
A Caffarelli-Kohn-Nirenberg type ineuality with variable exponent and applications to PDE s Mihai Mihăilescu a,b Vicenţiu Rădulescu a,c Denisa Stancu-Dumitru a a Department of Mathematics, University of
More informationESTIMATES FOR MAXIMAL SINGULAR INTEGRALS
ESTIMATES FOR MAXIMAL SINGULAR INTEGRALS LOUKAS GRAFAKOS Abstract. It is shown that maximal truncations of nonconvolution L -bounded singular integral operators with kernels satisfying Hörmander s condition
More informationCourse Description for Real Analysis, Math 156
Course Description for Real Analysis, Math 156 In this class, we will study elliptic PDE, Fourier analysis, and dispersive PDE. Here is a quick summary of the topics will study study. They re described
More informationThe heat equation in time dependent domains with Neumann boundary conditions
The heat equation in time dependent domains with Neumann boundary conditions Chris Burdzy Zhen-Qing Chen John Sylvester Abstract We study the heat equation in domains in R n with insulated fast moving
More informationPARTIAL REGULARITY OF BRENIER SOLUTIONS OF THE MONGE-AMPÈRE EQUATION
PARTIAL REGULARITY OF BRENIER SOLUTIONS OF THE MONGE-AMPÈRE EQUATION ALESSIO FIGALLI AND YOUNG-HEON KIM Abstract. Given Ω, Λ R n two bounded open sets, and f and g two probability densities concentrated
More informationSobolev spaces. May 18
Sobolev spaces May 18 2015 1 Weak derivatives The purpose of these notes is to give a very basic introduction to Sobolev spaces. More extensive treatments can e.g. be found in the classical references
More informationOn Liouville type theorems for the steady Navier-Stokes equations in R 3
On Liouville type theorems for the steady Navier-Stokes equations in R 3 arxiv:604.07643v [math.ap] 6 Apr 06 Dongho Chae and Jörg Wolf Department of Mathematics Chung-Ang University Seoul 56-756, Republic
More informationREGULARITY OF MONOTONE TRANSPORT MAPS BETWEEN UNBOUNDED DOMAINS
REGULARITY OF MONOTONE TRANSPORT MAPS BETWEEN UNBOUNDED DOMAINS DARIO CORDERO-ERAUSQUIN AND ALESSIO FIGALLI A Luis A. Caffarelli en su 70 años, con amistad y admiración Abstract. The regularity of monotone
More informationGEOMETRY FINAL CLAY SHONKWILER
GEOMETRY FINAL CLAY SHONKWILER 1 a: If M is non-orientale and p M, is M {p} orientale? Answer: No. Suppose M {p} is orientale, and let U α, x α e an atlas that gives an orientation on M {p}. Now, let V,
More informationERRATUM TO AFFINE MANIFOLDS, SYZ GEOMETRY AND THE Y VERTEX
ERRATUM TO AFFINE MANIFOLDS, SYZ GEOMETRY AND THE Y VERTEX JOHN LOFTIN, SHING-TUNG YAU, AND ERIC ZASLOW 1. Main result The purpose of this erratum is to correct an error in the proof of the main result
More informationSobolev regularity for the Monge-Ampère equation, with application to the semigeostrophic equations
Sobolev regularity for the Monge-Ampère equation, with application to the semigeostrophic equations Alessio Figalli Abstract In this note we review some recent results on the Sobolev regularity of solutions
More informationA regularity criterion for the 3D NSE in a local version of the space of functions of bounded mean oscillations
Ann. I. H. Poincaré AN 27 (2010) 773 778 www.elsevier.com/locate/anihpc A regularity criterion for the 3D NSE in a local version of the space of functions of bounded mean oscillations Zoran Grujić a,,
More informationMULTIPLE SOLUTIONS FOR CRITICAL ELLIPTIC PROBLEMS WITH FRACTIONAL LAPLACIAN
Electronic Journal of Differential Equations, Vol. 016 (016), No. 97, pp. 1 11. ISSN: 107-6691. URL: http://ejde.math.txstate.edu or http://ejde.math.unt.edu ftp ejde.math.txstate.edu MULTIPLE SOLUTIONS
More informationREGULARITY RESULTS FOR THE EQUATION u 11 u 22 = Introduction
REGULARITY RESULTS FOR THE EQUATION u 11 u 22 = 1 CONNOR MOONEY AND OVIDIU SAVIN Abstract. We study the equation u 11 u 22 = 1 in R 2. Our results include an interior C 2 estimate, classical solvability
More informationBIHARMONIC WAVE MAPS INTO SPHERES
BIHARMONIC WAVE MAPS INTO SPHERES SEBASTIAN HERR, TOBIAS LAMM, AND ROLAND SCHNAUBELT Abstract. A global weak solution of the biharmonic wave map equation in the energy space for spherical targets is constructed.
More informationA COUNTEREXAMPLE TO AN ENDPOINT BILINEAR STRICHARTZ INEQUALITY TERENCE TAO. t L x (R R2 ) f L 2 x (R2 )
Electronic Journal of Differential Equations, Vol. 2006(2006), No. 5, pp. 6. ISSN: 072-669. URL: http://ejde.math.txstate.edu or http://ejde.math.unt.edu ftp ejde.math.txstate.edu (login: ftp) A COUNTEREXAMPLE
More informationA RELATIONSHIP BETWEEN THE DIRICHLET AND REGULARITY PROBLEMS FOR ELLIPTIC EQUATIONS. Zhongwei Shen
A RELATIONSHIP BETWEEN THE DIRICHLET AND REGULARITY PROBLEMS FOR ELLIPTIC EQUATIONS Zhongwei Shen Abstract. Let L = diva be a real, symmetric second order elliptic operator with bounded measurable coefficients.
More informationA IMPROVEMENT OF LAX S PROOF OF THE IVT
A IMPROVEMEN OF LAX S PROOF OF HE IV BEN KORDESH AND WILLIAM RICHER. Introduction Let Cube = [, ] n R n. Lax gave an short proof of a version of the Change of Variables heorem (CV), which aylor clarified
More informationChapter One. The Calderón-Zygmund Theory I: Ellipticity
Chapter One The Calderón-Zygmund Theory I: Ellipticity Our story begins with a classical situation: convolution with homogeneous, Calderón- Zygmund ( kernels on R n. Let S n 1 R n denote the unit sphere
More informationNote on the Chen-Lin Result with the Li-Zhang Method
J. Math. Sci. Univ. Tokyo 18 (2011), 429 439. Note on the Chen-Lin Result with the Li-Zhang Method By Samy Skander Bahoura Abstract. We give a new proof of the Chen-Lin result with the method of moving
More informationA SHARP STABILITY ESTIMATE IN TENSOR TOMOGRAPHY
A SHARP STABILITY ESTIMATE IN TENSOR TOMOGRAPHY PLAMEN STEFANOV 1. Introduction Let (M, g) be a compact Riemannian manifold with boundary. The geodesic ray transform I of symmetric 2-tensor fields f is
More informationthe neumann-cheeger constant of the jungle gym
the neumann-cheeger constant of the jungle gym Itai Benjamini Isaac Chavel Edgar A. Feldman Our jungle gyms are dimensional differentiable manifolds M, with preferred Riemannian metrics, associated to
More informationTRAVELING WAVES IN 2D REACTIVE BOUSSINESQ SYSTEMS WITH NO-SLIP BOUNDARY CONDITIONS
TRAVELING WAVES IN 2D REACTIVE BOUSSINESQ SYSTEMS WITH NO-SLIP BOUNDARY CONDITIONS PETER CONSTANTIN, MARTA LEWICKA AND LENYA RYZHIK Abstract. We consider systems of reactive Boussinesq equations in two
More informationDIRECTION OF VORTICITY AND A REFINED BLOW-UP CRITERION FOR THE NAVIER-STOKES EQUATIONS WITH FRACTIONAL LAPLACIAN
DIRECTION OF VORTICITY AND A REFINED BLOW-UP CRITERION FOR THE NAVIER-STOKES EQUATIONS WITH FRACTIONAL LAPLACIAN KENGO NAKAI Abstract. We give a refined blow-up criterion for solutions of the D Navier-
More informationContinuous functions that are nowhere differentiable
Continuous functions that are nowhere differentiable S. Kesavan The Institute of Mathematical Sciences, CIT Campus, Taramani, Chennai - 600113. e-mail: kesh @imsc.res.in Abstract It is shown that the existence
More informationLORENTZ SPACE ESTIMATES FOR VECTOR FIELDS WITH DIVERGENCE AND CURL IN HARDY SPACES
- TAMKANG JOURNAL OF MATHEMATICS Volume 47, Number 2, 249-260, June 2016 doi:10.5556/j.tkjm.47.2016.1932 This paper is available online at http://journals.math.tku.edu.tw/index.php/tkjm/pages/view/onlinefirst
More informationMath The Laplacian. 1 Green s Identities, Fundamental Solution
Math. 209 The Laplacian Green s Identities, Fundamental Solution Let be a bounded open set in R n, n 2, with smooth boundary. The fact that the boundary is smooth means that at each point x the external
More informationON WEAKLY NONLINEAR BACKWARD PARABOLIC PROBLEM
ON WEAKLY NONLINEAR BACKWARD PARABOLIC PROBLEM OLEG ZUBELEVICH DEPARTMENT OF MATHEMATICS THE BUDGET AND TREASURY ACADEMY OF THE MINISTRY OF FINANCE OF THE RUSSIAN FEDERATION 7, ZLATOUSTINSKY MALIY PER.,
More informationTwo Lemmas in Local Analytic Geometry
Two Lemmas in Local Analytic Geometry Charles L Epstein and Gennadi M Henkin Department of Mathematics, University of Pennsylvania and University of Paris, VI This paper is dedicated to Leon Ehrenpreis
More informationOn periodic solutions of superquadratic Hamiltonian systems
Electronic Journal of Differential Equations, Vol. 22(22), No. 8, pp. 1 12. ISSN: 172-6691. URL: http://ejde.math.swt.edu or http://ejde.math.unt.edu ftp ejde.math.swt.edu (login: ftp) On periodic solutions
More informationMath 868 Final Exam. Part 1. Complete 5 of the following 7 sentences to make a precise definition (5 points each). Y (φ t ) Y lim
SOLUTIONS Dec 13, 218 Math 868 Final Exam In this exam, all manifolds, maps, vector fields, etc. are smooth. Part 1. Complete 5 of the following 7 sentences to make a precise definition (5 points each).
More informationRadial Symmetry of Minimizers for Some Translation and Rotation Invariant Functionals
journal of differential equations 124, 378388 (1996) article no. 0015 Radial Symmetry of Minimizers for Some Translation and Rotation Invariant Functionals Orlando Lopes IMECCUNICAMPCaixa Postal 1170 13081-970,
More informationA fixed point theorem for weakly Zamfirescu mappings
A fixed point theorem for weakly Zamfirescu mappings David Ariza-Ruiz Dept. Análisis Matemático, Fac. Matemáticas, Universidad de Sevilla, Apdo. 1160, 41080-Sevilla, Spain Antonio Jiménez-Melado Dept.
More informationRemarks on the blow-up criterion of the 3D Euler equations
Remarks on the blow-up criterion of the 3D Euler equations Dongho Chae Department of Mathematics Sungkyunkwan University Suwon 44-746, Korea e-mail : chae@skku.edu Abstract In this note we prove that the
More informationSobolev Spaces. Chapter 10
Chapter 1 Sobolev Spaces We now define spaces H 1,p (R n ), known as Sobolev spaces. For u to belong to H 1,p (R n ), we require that u L p (R n ) and that u have weak derivatives of first order in L p
More informationSYMMETRY OF POSITIVE SOLUTIONS OF SOME NONLINEAR EQUATIONS. M. Grossi S. Kesavan F. Pacella M. Ramaswamy. 1. Introduction
Topological Methods in Nonlinear Analysis Journal of the Juliusz Schauder Center Volume 12, 1998, 47 59 SYMMETRY OF POSITIVE SOLUTIONS OF SOME NONLINEAR EQUATIONS M. Grossi S. Kesavan F. Pacella M. Ramaswamy
More informationsatisfying the following condition: If T : V V is any linear map, then µ(x 1,,X n )= det T µ(x 1,,X n ).
ensities Although differential forms are natural objects to integrate on manifolds, and are essential for use in Stoke s theorem, they have the disadvantage of requiring oriented manifolds in order for
More informationP(E t, Ω)dt, (2) 4t has an advantage with respect. to the compactly supported mollifiers, i.e., the function W (t)f satisfies a semigroup law:
Introduction Functions of bounded variation, usually denoted by BV, have had and have an important role in several problems of calculus of variations. The main features that make BV functions suitable
More informationOn a Nonlocal Elliptic System of p-kirchhoff-type Under Neumann Boundary Condition
On a Nonlocal Elliptic System of p-kirchhoff-type Under Neumann Boundary Condition Francisco Julio S.A Corrêa,, UFCG - Unidade Acadêmica de Matemática e Estatística, 58.9-97 - Campina Grande - PB - Brazil
More informationTHE HOT SPOTS CONJECTURE FOR NEARLY CIRCULAR PLANAR CONVEX DOMAINS
THE HOT SPOTS CONJECTURE FOR NEARLY CIRCULAR PLANAR CONVEX DOMAINS YASUHITO MIYAMOTO Abstract. We prove the hot spots conjecture of J. Rauch in the case that the domain Ω is a planar convex domain satisfying
More informationASYMPTOTICALLY NONEXPANSIVE MAPPINGS IN MODULAR FUNCTION SPACES ABSTRACT
ASYMPTOTICALLY NONEXPANSIVE MAPPINGS IN MODULAR FUNCTION SPACES T. DOMINGUEZ-BENAVIDES, M.A. KHAMSI AND S. SAMADI ABSTRACT In this paper, we prove that if ρ is a convex, σ-finite modular function satisfying
More information1 Topology Definition of a topology Basis (Base) of a topology The subspace topology & the product topology on X Y 3
Index Page 1 Topology 2 1.1 Definition of a topology 2 1.2 Basis (Base) of a topology 2 1.3 The subspace topology & the product topology on X Y 3 1.4 Basic topology concepts: limit points, closed sets,
More informationFunctions with orthogonal Hessian
Functions with orthogonal Hessian B. Dacorogna P. Marcellini E. Paolini Abstract A Dirichlet problem for orthogonal Hessians in two dimensions is eplicitly solved, by characterizing all piecewise C 2 functions
More informationOn non negative solutions of some quasilinear elliptic inequalities
On non negative solutions of some quasilinear elliptic inequalities Lorenzo D Ambrosio and Enzo Mitidieri September 28 2006 Abstract Let f : R R be a continuous function. We prove that under some additional
More informationDEGREE AND SOBOLEV SPACES. Haïm Brezis Yanyan Li Petru Mironescu Louis Nirenberg. Introduction
Topological Methods in Nonlinear Analysis Journal of the Juliusz Schauder Center Volume 13, 1999, 181 190 DEGREE AND SOBOLEV SPACES Haïm Brezis Yanyan Li Petru Mironescu Louis Nirenberg Dedicated to Jürgen
More informationLACK OF HÖLDER REGULARITY OF THE FLOW FOR 2D EULER EQUATIONS WITH UNBOUNDED VORTICITY. 1. Introduction
LACK OF HÖLDER REGULARITY OF THE FLOW FOR 2D EULER EQUATIONS WITH UNBOUNDED VORTICITY JAMES P. KELLIHER Abstract. We construct a class of examples of initial vorticities for which the solution to the Euler
More informationCONTROLLABILITY OF NONLINEAR DISCRETE SYSTEMS
Int. J. Appl. Math. Comput. Sci., 2002, Vol.2, No.2, 73 80 CONTROLLABILITY OF NONLINEAR DISCRETE SYSTEMS JERZY KLAMKA Institute of Automatic Control, Silesian University of Technology ul. Akademicka 6,
More informationON PARABOLIC HARNACK INEQUALITY
ON PARABOLIC HARNACK INEQUALITY JIAXIN HU Abstract. We show that the parabolic Harnack inequality is equivalent to the near-diagonal lower bound of the Dirichlet heat kernel on any ball in a metric measure-energy
More informationPeriodic solutions of weakly coupled superlinear systems
Periodic solutions of weakly coupled superlinear systems Alessandro Fonda and Andrea Sfecci Abstract By the use of a higher dimensional version of the Poincaré Birkhoff theorem, we are able to generalize
More informationUniqueness of ground states for quasilinear elliptic equations in the exponential case
Uniqueness of ground states for quasilinear elliptic equations in the exponential case Patrizia Pucci & James Serrin We consider ground states of the quasilinear equation (.) div(a( Du )Du) + f(u) = 0
More informationNonexistence of solutions for quasilinear elliptic equations with p-growth in the gradient
Electronic Journal of Differential Equations, Vol. 2002(2002), No. 54, pp. 1 8. ISSN: 1072-6691. URL: http://ejde.math.swt.edu or http://ejde.math.unt.edu ftp ejde.math.swt.edu (login: ftp) Nonexistence
More informationCOMPARISON PRINCIPLES FOR CONSTRAINED SUBHARMONICS PH.D. COURSE - SPRING 2019 UNIVERSITÀ DI MILANO
COMPARISON PRINCIPLES FOR CONSTRAINED SUBHARMONICS PH.D. COURSE - SPRING 2019 UNIVERSITÀ DI MILANO KEVIN R. PAYNE 1. Introduction Constant coefficient differential inequalities and inclusions, constraint
More informationSpectrum of one dimensional p-laplacian Operator with indefinite weight
Spectrum of one dimensional p-laplacian Operator with indefinite weight A. Anane, O. Chakrone and M. Moussa 2 Département de mathématiques, Faculté des Sciences, Université Mohamed I er, Oujda. Maroc.
More informationOn Shalom Tao s Non-Quantitative Proof of Gromov s Polynomial Growth Theorem
On Shalom Tao s Non-Quantitative Proof of Gromov s Polynomial Growth Theorem Carlos A. De la Cruz Mengual Geometric Group Theory Seminar, HS 2013, ETH Zürich 13.11.2013 1 Towards the statement of Gromov
More informationPseudo-Poincaré Inequalities and Applications to Sobolev Inequalities
Pseudo-Poincaré Inequalities and Applications to Sobolev Inequalities Laurent Saloff-Coste Abstract Most smoothing procedures are via averaging. Pseudo-Poincaré inequalities give a basic L p -norm control
More information1 Directional Derivatives and Differentiability
Wednesday, January 18, 2012 1 Directional Derivatives and Differentiability Let E R N, let f : E R and let x 0 E. Given a direction v R N, let L be the line through x 0 in the direction v, that is, L :=
More informationHAIYUN ZHOU, RAVI P. AGARWAL, YEOL JE CHO, AND YONG SOO KIM
Georgian Mathematical Journal Volume 9 (2002), Number 3, 591 600 NONEXPANSIVE MAPPINGS AND ITERATIVE METHODS IN UNIFORMLY CONVEX BANACH SPACES HAIYUN ZHOU, RAVI P. AGARWAL, YEOL JE CHO, AND YONG SOO KIM
More informationCOMPACT DIFFERENCE OF WEIGHTED COMPOSITION OPERATORS ON N p -SPACES IN THE BALL
COMPACT DIFFERENCE OF WEIGHTED COMPOSITION OPERATORS ON N p -SPACES IN THE BALL HU BINGYANG and LE HAI KHOI Communicated by Mihai Putinar We obtain necessary and sucient conditions for the compactness
More informationExtensions of Lipschitz functions and Grothendieck s bounded approximation property
North-Western European Journal of Mathematics Extensions of Lipschitz functions and Grothendieck s bounded approximation property Gilles Godefroy 1 Received: January 29, 2015/Accepted: March 6, 2015/Online:
More informationAnisotropic partial regularity criteria for the Navier-Stokes equations
Anisotropic partial regularity criteria for the Navier-Stokes equations Walter Rusin Department of Mathematics Mathflows 205 Porquerolles September 7, 205 The question of regularity of the weak solutions
More information