Nonlocal self-improving properties
|
|
- Opal Clark
- 5 years ago
- Views:
Transcription
1 Nonlocal self-improving properties Tuomo Kuusi (Aalto University) July 23rd, 2015 Frontiers of Mathematics And Applications IV UIMP 2015
2 Part 1: The local setting Self-improving properties:
3 Meyers estimate Theorem (Meyers) Let u be a local weak solution to div (a(x)du) = 0 in R n, where a( ) is measurable and satisfies ξ 2 Λ a(x)ξ, ξ and a(x) Λ. Then u W 1,2 loc = u W 1,2+δ loc for some δ > 0 depending only on n, Λ
4 The Gehring lemma This is based on a modification of the seminal result of Gehring: Theorem (Gehring) Let f L p loc (Rn ) be such that ( 1/p ( f dx) p B B ) 1/q f q dx for q < p and for every ball B. Then f L p+δ loc (Rn ) for some δ > 0 and ( 1/(p+δ) ( ) 1/q f dx) p+δ f q dx B B
5 Inhomogeneous case Theorem (Elcrat-Meyers, Giaquinta-Modica) Let u W 1,2 loc be a weak solution to where z 2 Λ div a(x, Du) = f L 2+δ 0, a(x, z), z and a(x, z) Λ z.
6 Inhomogeneous case Theorem (Elcrat-Meyers, Giaquinta-Modica) Let u W 1,2 loc be a weak solution to where Then z 2 Λ div a(x, Du) = f L 2+δ 0, a(x, z), z and a(x, z) Λ z. u W 1,2 = u W 1,2+δ loc for some δ (0, δ 0 ] depending only on n, Λ, δ 0.
7 Inhomogeneous case Moreover, the local estimate ( Du 2+δ dx B R holds for any ball B R. ) 1 ( ) 1 2+δ Du 2 2 dx B 2R ( + f 2+δ 0 dx B 2R ) 1 2+δ 0
8 The Gehring lemma with additional terms Theorem (Gehring-Giaquinta-Modica) Let f L p loc (Ω) be such that for q < p, then ( ) 1/p ( 1/q ( f p dx f dx) q B B B ( ) 1/(p+δ) ( f p+δ dx 1 2 B B ) 1/q f q dx ( + B ) 1/p g p dx ) 1/(p+δ) g p+δ dx
9 Caccioppoli inequalities imply higher integrability Theorem Let u W 1,2 (R n ) such that for every ball B B(x 0, r) R n Du 2 dx B r 2 u(x) (u) B 2 dx B holds; then there exists δ > 0 such that u W 1,2+δ loc (R n )
10 Caccioppoli inequalities imply higher integrability The proof is very simple: Sobolev-Poincaré yields ( B/2 1/2 ( (n+2)/2n Du dx) 2 Du dx) 2n/(n+2), B and the assertion follows from an adaptation of the Gehring lemma.
11 Gradient oscillations What about the higher regularity? For solutions to we have a( ) is Dini = Du C 0 a( ) C 0,σ = Du C 0,σ a( ) N σ,q = Du N σ,2 div (a(x)du) = 0 Recall that a( ) N σ,q means that a(x + h) a(x) q dx h qσ Oscillations of coefficients influence the oscillations of the gradient
12 Merely measurable coefficients If the coefficients are merely measurable, there is no gradient oscillation control.
13 Merely measurable coefficients If the coefficients are merely measurable, there is no gradient oscillation control. Indeed, consider n = 1 and with (a(x)u x ) x = 0, u(0) = 0, u(1) = 1. Then the solution is given by u(x) = M x 0 0 < ν a(x) L. dt a(t), u x(x) = M [ 1 ] 1 a(x), M := dt. 0 a(t) i.e., no gradient differentiability is possible when coefficients are just measurable.
14 Integrodifferential equations Part 2: The nonlocal setting
15 Integrodifferential equations We consider E K (u, η) = f η dx R n for every test function η Cc (R n ), where E K (u, η) := [u(x) u(y)][η(x) η(y)]k(x, y) dx dy. R n R n The Kernel K(, ) is assumed to be symmetric and measurable satisfying growth bounds for some Λ 1. 1 Λ K(x, y) Λ x y n+2α x y n+2α
16 Integrodifferential equations Heuristically speaking, the nonlocal equation E K (u, η) = R f η dx n for all η Cc (R n ) is the weak formulation of L K u(x) = p.v. (u(x) u(y))k(x, y) dy = 1 R n 2 f (x). In the case K(x, y) = c n,α x y n 2α the operator is the fractional Laplacian, and the equation reduces to ( ) α u = f.
17 Integrodifferential equations Furthermore, in the case K(x, y) = x y n 2α we have u(x) u(y) η(x) η(y) dx dy E K (u, η) = R n R n x y α x y α x y n, which is the nonlocal analog of Du, Dη dx.
18 Integrodifferential equations - some regularity results Bass & Kassmann (Comm. PDE, TAMS 05) Caffarelli & Silvestre (Comm. PDE 07, lifting and localization) Kassmann (Calc. Var. 09, measurable coefficients) Caffarelli & Chan & Vasseur (JAMS 07, lifting and localization) Bjorland & Caffarelli & Figalli (Adv. Math. 09, p-laplacean type) Caffarelli & Silvestre (Ann. Math. 11, fully nonlinear theory) Da Lio & Rivière (Analysis & PDE 11, Adv. Math. 11, systems and half-harmonic maps) Di Castro & K. & Palatucci (JFA 14, Poincare 15, p-growth and related theory)
19 Fractional energies For α (0, 1) and p [1, ), define the seminorm Then ( [u] α,p (R n ) := R n Rn u(x) u(y) p ) 1/p x y n+αp dx dy W α,p (R n ) = {u L p (R n ) : u L p (R n ) + [u] α,p (R n )}. In the case p = 2 the abbreviation is H α (R n ) = W α,2 (R n ).
20 Fractional energies For α (0, 1) and p [1, ), define the seminorm Then ( [u] α,p (R n ) := R n Rn u(x) u(y) p ) 1/p x y n+αp dx dy W α,p (R n ) = {u L p (R n ) : u L p (R n ) + [u] α,p (R n )}. In the case p = 2 the abbreviation is H α (R n ) = W α,2 (R n ). The usual gradient can be obtained by letting α 1, but only after renormalisation by a factor depending on 1 α, see Bourgain & Brezis & Mironescu
21 Integrodifferential equations Energy solutions are initially considered in u H α (R n ), f L 2 (R n ) : E K (u, η) = f η dx, R n and the analogue of the Meyers property would be now u W α,2+δ, δ > 0 upon considering f L q (R n ) for some q > 2
22 A first result Theorem (Bass & Ren, JFA 13) Define the α-gradient (Rn u(y) u(x) 2 Γ(x) := dy x y n+2α ) 1/2 for the solution. Then Γ L 2+δ
23 A first result Theorem (Bass & Ren, JFA 13) Define the α-gradient (Rn u(y) u(x) 2 Γ(x) := dy x y n+2α ) 1/2 for the solution. Then Γ L 2+δ This implies, via a delicate yet by-now classical characterisation of Bessel potential spaces due to Strichartz and Stein, that for some δ > 0. u W α,2+δ
24 A first result Theorem (Bass & Ren, JFA 13) Define the α-gradient (Rn u(y) u(x) 2 Γ(x) := dy x y n+2α ) 1/2 for the solution. Then Γ L 2+δ This implies, via a delicate yet by-now classical characterisation of Bessel potential spaces due to Strichartz and Stein, that u W α,2+δ for some δ > 0. However, a stronger result actually holds.
25 Self-improving property Theorem (K. & Mingione & Sire - Analysis & PDE 2015) Let u H α be a solution to E K (u, η) = f η for all η Cc. If f L 2+δ 0, then u W α+δ,2+δ for some δ > 0.
26 Self-improving property Theorem (K. & Mingione & Sire - Analysis & PDE 2015) Let u H α be a solution to E K (u, η) = f η for all η Cc. If f L 2+δ 0, then u W α+δ,2+δ for some δ > 0. In particular, Sobolev embedding W s,q W t,p for q > p and s n q = t n p gives u W α+δ,2+δ for some δ (0, δ)
27 Self-improving property Theorem (K. & Mingione & Sire - Analysis & PDE 2015) Let u H α be a solution to E K (u, η) = f η for all η Cc. If f L 2+δ 0, then u W α+δ,2+δ for some δ > 0. In particular, Sobolev embedding W s,q W t,p for q > p and s n q = t n p gives u W α+δ,2+δ for some δ (0, δ) As we saw, this theorem has no analog in the local case, where the improvement is only in the integrability scale u W 1,2+δ loc
28 The general case In the local case the most general equation that can be considered is div (A(x)Du) = div (B(x)g) + f. This corresponds to take in the right hand side all possible orders of differentiation, that in the integer case means taking orders zero and one.
29 The general case We therefore consider equations of the type E K (u, η) = E H (g, η) + f η dx η Cc (R n ), R n where the kernel H( ) satisfies H(x, y) A model case is obviously given by Λ x y n+2β ( ) α u = ( ) β g + f, where the analysis can be done via Fourier analysis.
30 Dimension analysis reveals the optimal assumptions Let us start with ( ) α u = f L p. C-Z theory gives u W 2α,p. Then we recall the embedding W 2α,p W α,2 provided the following interpolation scale relation holds: 2α n p = α n 2. This gives f L 2n n+2α f L 2n n+2α +δ 0
31 Dimension analysis reveals the optimal assumptions Continue with ( ) α u = ( ) β g In the case α = β we immediately see g W α,2 In the case 2β α then we formally invert the operators α u β α/2 g 2β α g L 2. Therefore we arrive at g W 2β α,2 g W 2β α+δ0,2.
32 Dimension analysis reveals the optimal assumptions In the case 2β < α no differentiability is needed on g Consider W 2β α,2 as the dual of W α 2β,2 and eventually observe the embedding But now ( L therefore we conclude with W α 2β,2 L 2n n 2(α 2β) 2n n 2(α 2β). ) = L 2n n+2(α 2β) ; g L 2n n+2(α 2β) g L 2n n+2(α 2β) +δ 0.
33 The Theorem Theorem (K. & Mingione & Sire) Under the optimal assumptions f L 2n 2+2α +δ 0 loc g W 2β α+δ 0,2 g L 2n n+2(α 2β) +δ 0 if 2β α if 2β < α, any H α -solution u to the equation E K (u, η) = E H (g, η) + f, η η C c is such that u W α+δ,2+δ loc (R n )
34 A first sketch of the proof Part 4: A fractional approach to Gehring lemma
35 Caccioppoli inequalities imply higher integrability - local case Theorem Let u W 1,2 (R n ) such that for every ball B B(x 0, r) R n Du 2 dx 1 r 2 u(x) (u) B 2 dx B/2 holds; then there exists δ > 0 such that B u W 1,2+δ loc (R n )
36 Caccioppoli inequalities imply higher integrability - nonlocal case Theorem (K. & Mingione & Sire) Let u H α (R n ) such that for every ball B B(x 0, r) R n B B u(x) u(y) 2 1 dx dy x y n+2α r 2α u(x) (u) B 2 dx B u(y) (u) B + dy u(x) (u) x 0 y n+2α B dx R n \B holds; then there exists δ > 0 such that u W α+δ,2+δ loc (R n ) B
37 Key observation u W 1,2 means that Du 2 is integrable w.r.t. a finite measure (i.e. the Lebesgue measure)
38 Key observation u W 1,2 means that Du 2 is integrable w.r.t. a finite measure (i.e. the Lebesgue measure) u W α,2 means that [ u(x) u(y) x y α is integrable w.r.t. an infinite set function, that is dx dy E x y n. E ] 2
39 Key observation u W 1,2 means that Du 2 is integrable w.r.t. a finite measure (i.e. the Lebesgue measure) u W α,2 means that [ u(x) u(y) x y α is integrable w.r.t. an infinite set function, that is dx dy E x y n. E Therefore there are potentially more regularity properties to exploit in the above fractional difference quotient. ] 2
40 Key idea: Dual pairs To each u and ε < (0, 1 α) we associate a function U(x, y) := u(x) u(y) x y α+ε and a finite and doubling measure dx dy µ(e) := x y n 2ε. Note that they are in duality in the sense that E u W α,2 U L 2 (µ).
41 Strategy: higher integrability for U w.r.t. µ We translate the Caccioppoli inequality for u in a reverse Hölder inequality for U w.r.t. µ We prove a version of Gehring lemma for dual pairs (µ, U) The higher integrability of U turns into the higher differentiability of u All estimates heavily degenerate when α 1 or α 0
42 Higher integrability = higher differentiability Assume U L 2+δ loc, i.e., U 2+δ dµ = B B B B u(x) u(y) 2+δ dx dy <. x y n+(2+δ)α+εδ Rewrite it as follows: u(x) u(y) 2+δ dx dy <. x y n+(2+δ)[α+εδ/(2+δ)] B B But this means that u W α+εδ/(2+δ),2+δ loc (R n ), i.e., we have gained also differentiability!
43 Reverse inequality for dual pairs (µ, U) Proposition (K. & Mingione & Sire) For every σ (0, 1), the Caccioppoli inequality implies for the dual pair (µ, U) that ( 1/2 ( ) U dµ) 2 c 1/q B σε 1/q 1/2 U q dµ 2B + σ ε 1/q 1/2 2 ( k(α ε) k=1 holds, where B = B B and [ ) 2n q n + 2α, 2. 2 k B ) 1/q U q dµ
44 The Gehring lemma for dual pairs (µ, U) Theorem (K. & Mingione & Sire) Assume that for every σ (0, 1) the pair (µ, U) satisfies ( 1/2 ( U dµ) 2 c(σ) B +σ 2B ) 1/q U q dµ k=2 1/q 2 ( k(α ε) U dµ) q, 2 k B where q (1, 2) and for every choice of B = B B. Then U L 2+δ loc for some δ > 0 and ( 1/(2+δ) U dµ) 2+δ B k=1 ) 1/q 2 ( k(α ε) U q dµ 2 k B
45 Sketch Part 5: Brief sketch of the Gehring lemma for dual pairs
46 Step 1: Conclusion via a level set inequality We reduce to prove the Gehring inequality on level sets, that is U 2 dµ λ 2 q U q dµ holds provided B {U>λ} λ 0 := k=1 B {U>λ} 1/2 2 ( k(α ε) U dµ) 2 λ 2 k B then standard Cavalieri s principle yields the result.
47 Step 1: Conclusion via a level set inequality We reduce to prove the Gehring inequality on level sets, that is U 2 dµ λ 2 q U q dµ holds provided B {U>λ} λ 0 := k=1 B {U>λ} 1/2 2 ( k(α ε) U dµ) 2 λ 2 k B then standard Cavalieri s principle yields the result. Warning! There is a need for a rather technical localization argument, which will be omitted here.
48 Step 1: Conclusion via a level set inequality Indeed, denoting U m = min(u, m), m λ 0, and ν = U 2 dµ, we have m Um δ dν = δ λ δ 1 ν({u > λ}) dλ 0 m λ δ 0 U 2 dµ + δ λ δ 1 U 2 dµ dλ λ 0 {U>λ} m λ δ 0 U 2 dµ + cδ λ δ+1 q U q dµ dλ λ 0 {U>λ} λ δ 0 U 2 cδ dµ + Um δ+2 q U q dµ δ + 2 q λ δ 0 U 2 dµ + cδ Um δ dν 2 q
49 Step 1: Conclusion via a level set inequality By choosing δ small enough to get cδ 2 q 1 2 we obtain, after reabsorption and sending m, U 2+δ dµ 2λ δ 0 U 2 dµ cλ 2+δ 0.
50 Step 1: Conclusion via a level set inequality By choosing δ small enough to get cδ 2 q 1 2 we obtain, after reabsorption and sending m, U 2+δ dµ 2λ δ 0 U 2 dµ cλ 2+δ 0. Thus the goal is to obtain the level set inequality U 2 dµ λ 2 q U q dµ. B {U>λ} B {U>λ}
51 Step 2: Global Calderón-Zygmund covering We will apply C-Z decomposition at level Mλ in R 2n for M 1 to get a disjoint family of product of dyadic cubes {Q i } i, where Q = Q 1 Q 2 and Q 1 and Q 2 are dyadic cubes in R n with same size, such that ( ) 1/2 U 2 dµ Mλ Q i and We let U Mλ outside i U λ := {Q i } We denote by k(q) the generation of Q, i.e., 2 nk(q) = Q 1. Q i
52 Step 2: Classification of the cubes We call off-diagonal cubes Q = Q 1 Q 2 those whose distance from the diagonal is larger than their sidelength: 2 k(q)+3 dist(q) := dist(q 1, Q 2 ). The nearly diagonal cubes are then collected to { Uλ d := Q = Q 1 Q 2 U λ : dist(q 1, Q 2 ) < 2 3 k(q)} and we set U nd λ = {Q U λ : Q / U d λ }.
53 Idea: Step 2: Splitting of the analysis The diagonal cubes in Uλ d can be treated with the aid of an auxiliary diagonal cover. To treat these we will use the assumed diagonal reverse type Hölder inequality ( 1/2 ( U dµ) 2 c(σ) B +σ B ) 1/q U q dµ k=2 1/q 2 ( k(α ε) U dµ) q. 2 k B
54 Idea: Step 2: Splitting of the analysis The diagonal cubes in Uλ d can be treated with the aid of an auxiliary diagonal cover. To treat these we will use the assumed diagonal reverse type Hölder inequality ( 1/2 ( U dµ) 2 c(σ) B +σ B ) 1/q U q dµ k=2 1/q 2 ( k(α ε) U dµ) q. 2 k B For the non-diagonal cubes in Uλ nd the fractional Poincaré inequality implies automatically a reverse type Hölder s inequality. Unfortunately this comes with error terms, whose analysis lead to heavy combinatorial arguments.
55 Step 3: Diagonal exit time argument and covering We consider the quantity ( 1/2 Ψ(x, ϱ) := U dµ) 2, B(x, ϱ) B(x, ϱ) B(x, ϱ). Notice that B(x,ϱ) Ψ(x, 1) λ 0 := k=1 ) 1/2 2 ( k(α ε) U 2 dµ. 2 k B 1 Therefore we can find a radius ϱ(x), such that ( 1/2 Ψ(x, ϱ(x)) U dµ) 2 λ whenever λ λ 0 and B(x,ϱ(x)) x {y R n : sup Ψ(y, ϱ) > λ}. ϱ>0
56 Step 3: Diagonal exit time argument and covering By Vitali s covering theorem we can now extract an at most countable covering B(x, 2 10 n ϱ(x)) B(x j, 10 n+1 ϱ(x j )) x j J D and moreover we have j U 2 dµ λ 2 B(x j,10 n+1 ϱ(x j )) j = λ 2 j µ(b(x j, ϱ(x j ))) µ(b j ).
57 Step 4: First summation formula We recall the diagonal reverse Hölder inequality, that is ( ) 1/2 ( U 2 dµ c(σ) U q dµ B j 2B j +σ The exit time argument gives k=2 ( λ U 2 dµ B j ) 1/q ) 1/q 2 ( k(α ε) U q dµ. 2 k B j ) 1/2 so that ( ) 1/q λ c(σ) U q dµ + cσλ. 2B j
58 Step 4: First summation formula We have, for small enough universal σ, that ( λ U q dµ 2B j ) 1/q and hence µ(b j ) 1 λ q 2B j U q dµ. Adjusting the constants properly µ(b j ) 1 λ q 2B j {U>λ} U q dµ, summation yields λ 2 j µ(b j ) λ 2 q {U>λ} U q dµ.
59 Step 4: First summation formula Therefore, we have where we recall that U 2 dµ U 2 dµ Q U d Q {U>Mλ} λ j 10 n+1 B j λ 2 µ(b j ) j J D λ 2 q {U>λ} U q dµ, U d λ := {Q = Q 1 Q 2 U λ : dist(q 1, Q 2 ) < 2 3 k(q)}.
60 Step 5: Off-diagonal cubes I What happens for the off-diagonal cubes?
61 Step 5: Off-diagonal cubes I What happens for the off-diagonal cubes? By the fractional Poincaré inequality we get for ( 1/2 ( U dµ) 2 2n n+2s Q Q q < 2. We denote here for Q = Q 1 Q 2. ) 1/q U q dµ ( ) α+ε ( 2 k(q) + dist(q) ( ) α+ε ( 2 k(q) + dist(q) P 1 Q P 2 Q P 1 Q = Q 1 Q 1 P 2 Q = Q 2 Q 2 ) 1/q U q dµ ) 1/q U q dµ
62 Step 5: Off-diagonal cubes I But with a priori nasty diagonal correction terms: ( 1/2 ( U dµ) 2 Q Q ) 1/q U q dµ ( ) α+ε ( 2 k(q) + dist(q) ( ) α+ε ( 2 k(q) + dist(q) P 1 Q P 2 Q ) 1/q U q dµ U q dµ) 1/q.
63 Step 5: Off-diagonal cubes I It follows that µ(q) 1 λ q Q {U>λ} + 1 λ q µ(q) µ(p 1 Q) + 1 λ q µ(q) µ(p 2 Q) U q dµ ( 2 k(q) ) q(α+ε) dist(q) ( ) q(α+ε) 2 k(q) dist(q) U q dµ P 1 Q {U>λ} U q dµ. P 2 Q {U>λ}
64 Step 6: Further classification of off-diagonal cubes We further classify M h λ := { Q U nd λ } : U q dµ λ q, h {1, 2}, P h Q and N h λ := { Q U nd λ } : U q dµ λ q, h {1, 2}, P h Q and finally set M λ := M 1 λ M2 λ and N λ := N 1 λ N 2 λ.
65 Step 7: Soft summation We then have a first, soft summation formula µ(q) 1 λ q U q dµ Q M {U>λ} λ after adjusting parameters suitably.
66 Step 7: Soft summation We then have a first, soft summation formula µ(q) 1 λ q U q dµ Q M {U>λ} λ after adjusting parameters suitably. We now need a similar summation formula for N λ := Nλ 1 N λ 2.
67 Step 8: Hard summation We consider those cubes that are not covered by the diagonal covering N λ,nd := Q N λ : Q 10B j j J D and prove the hard summation formula obtained with some heavy covering and combinatorics argument µ(q) 1 λ q U q dµ Q N {U>λ} λ,nd
68 Step 8: Sketch of the proof for hard summation Get a disjoint covering of the projections of the bad cubes N λ and call it PN λ = {H} and operate the first decomposition Nλ,nd h = Nλ,nd h (H), H PN λ with N h λ,nd (H) := {Q N λ,nd : P h Q H}, h {1, 2}. Then define } [Nλ,nd h (H)] i := {Q Nλ,nd h (H) : k(q) = i + k(h)
69 Step 8: Sketch of the proof for hard summation so that N h λ,nd (H) = i [N h λ,nd (H)] i Finally, we set [Nλ,nd h (H)] i,j := {Q [Nλ,nd h (H)] i : 2 j k(h) dist(q) < 2 j+1 k(h)} to obtain a disjoint decomposition Nλ,nd h = [Nλ,nd h (H)] i,j H PN λ i,j
70 Step 8: Sketch of the proof for hard summation Combinatorics then gives Q N h λ,nd (H) ( ) q(α+ε) µ(q) 2 k(q) U q dµ µ(p h Q) dist(q) P h Q {U>κλ} U q dµ H {U>κλ} for every H PN λ Then the hard summation formula follows by summing up on H PN λ, and recalling that PN λ is a disjoint covering
71 Step 9: Final summation Since now U λ = U d λ U nd λ and U nd λ = M λ N λ,d N λ,nd, we have actually obtained a summation estimate for all of these collections and hence conclude with the desired inequality: U 2 dµ λ 2 µ(b j ) + λ 2 µ(q) {U>λ} j J D Q M λ N λ,nd λ 2 µ(b j ) + λ 2 q U q dµ j J {U>λ} D λ 2 q U q dµ {U>λ}
72 Non-homogeneous equations Equations of the type E K (u, η) = E H (g, η) + f η dx R n η Cc (R n ), where H(x, y) Λ x y n+2β f L 2+δ 0 loc g W 2β α+δ 0,2
73 Non-homogeneous equations - β = α We further define G(x, y) := g(x) g(y) x y α+ε, F (x, y) := f (x) so that G L 2+δg loc (R 2n ; µ), F L 2+δ f loc (R 2n ; µ)
74 Non-homogeneous equations - β = α The reverse Hölder inequality provided by the Caccioppoli inequality becomes ( 1/2 ( ) U dµ) 2 c 1/q B σε 1/q 1/2 U q dµ 2B + σ ε 1/q 1/2 2 ( k(α ε) ( +c 2B + c b[µ(b)] θ ε 1/p 1/2 k=1 ) 1/2 F 2 dµ k=1 2 k B ) 1/q U q dµ 1/2 2 ( k(α ε) G dµ) 2. 2 k B
75 Non-homogeneous equations - β = α Then a non-homogeneous implementation of the previous argument gives ( 1/(2+δ) ) 1/2 U dµ) 2+δ c 2 ( k(α ε) U 2 dµ B 2 k B k=1 +cϱ α ε 0 ( +c +c 2B ( 2B ) 1/(2+δ0 ) F 2+δ 0 dµ G 2(1+δ 1) dµ 2 ( k(α ε) k=1 ) 1/[p(1+δ1 )] 2 k B ) 1/p G p dµ
76 Closing remarks The sketch above gives a very simplified overview of the proof, which is actually featuring many more technicalities
77 Closing remarks The sketch above gives a very simplified overview of the proof, which is actually featuring many more technicalities Our approach is based only on energy estimates and does not use the linearity of the equation. Therefore it can be easily adapted to the case of nonlinear integrodifferential equations, with possibly degenerate operators of the type E K (u, η) := Φ(u(x) u(y))[η(x) η(y)]k(x, y) dx dy R n R n with Φ(t)t t p 1 t R \ {0}, 1 < p <.
78 Thank you for your attention!
Regularity of Weak Solution to Parabolic Fractional p-laplacian
Regularity of Weak Solution to Parabolic Fractional p-laplacian Lan Tang at BCAM Seminar July 18th, 2012 Table of contents 1 1. Introduction 1.1. Background 1.2. Some Classical Results for Local Case 2
More informationNonlinear aspects of Calderón-Zygmund theory
Ancona, June 7 2011 Overture: The standard CZ theory Consider the model case u = f in R n Overture: The standard CZ theory Consider the model case u = f in R n Then f L q implies D 2 u L q 1 < q < with
More informationarxiv: v1 [math.ca] 15 Dec 2016
L p MAPPING PROPERTIES FOR NONLOCAL SCHRÖDINGER OPERATORS WITH CERTAIN POTENTIAL arxiv:62.0744v [math.ca] 5 Dec 206 WOOCHEOL CHOI AND YONG-CHEOL KIM Abstract. In this paper, we consider nonlocal Schrödinger
More informationDuality of multiparameter Hardy spaces H p on spaces of homogeneous type
Duality of multiparameter Hardy spaces H p on spaces of homogeneous type Yongsheng Han, Ji Li, and Guozhen Lu Department of Mathematics Vanderbilt University Nashville, TN Internet Analysis Seminar 2012
More informationRiesz potentials and nonlinear parabolic equations
Dark Side manuscript No. (will be inserted by the editor) Riesz potentials and nonlinear parabolic equations TUOMO KUUSI & GIUSEPPE MINGIONE Abstract The spatial gradient of solutions to nonlinear degenerate
More informationJUHA KINNUNEN. Harmonic Analysis
JUHA KINNUNEN Harmonic Analysis Department of Mathematics and Systems Analysis, Aalto University 27 Contents Calderón-Zygmund decomposition. Dyadic subcubes of a cube.........................2 Dyadic cubes
More informationTo appear in the Journal of the European Mathematical Society VECTORIAL NONLINEAR POTENTIAL THEORY
To appear in the Journal of the European Mathematical Society VECTORIAL NONLINEAR POTENTIAL THEORY TUOMO KUUSI AND GIUSEPPE MINGIONE Abstract. We settle the longstanding problem of establishing pointwise
More informationLinear potentials in nonlinear potential theory
Dark Side manuscript No. (will be inserted by the editor) Linear potentials in nonlinear potential theory TUOMO KUUSI & GIUSEPPE MINGIONE Abstract Pointwise gradient bounds via Riesz potentials like those
More informationHARMONIC ANALYSIS. Date:
HARMONIC ANALYSIS Contents. Introduction 2. Hardy-Littlewood maximal function 3. Approximation by convolution 4. Muckenhaupt weights 4.. Calderón-Zygmund decomposition 5. Fourier transform 6. BMO (bounded
More informationA note on W 1,p estimates for quasilinear parabolic equations
200-Luminy conference on Quasilinear Elliptic and Parabolic Equations and Systems, Electronic Journal of Differential Equations, Conference 08, 2002, pp 2 3. http://ejde.math.swt.edu or http://ejde.math.unt.edu
More informationQuasilinear nonlocal operators, fractional Sobolev spaces, nonlocal tail, Caccioppoli estimates, obstacle problem.
HÖLDER CONTINUITY UP TO THE BOUNDARY FOR A CLASS OF FRACTIONAL OBSTACLE PROBLEMS JANNE KORVENPÄÄ, TUOMO KUUSI, AND GIAMPIERO PALATUCCI Abstract. We deal with the obstacle problem for a class of nonlinear
More informationHIGHER INTEGRABILITY WITH WEIGHTS
Annales Academiæ Scientiarum Fennicæ Series A. I. Mathematica Volumen 19, 1994, 355 366 HIGHER INTEGRABILITY WITH WEIGHTS Juha Kinnunen University of Jyväskylä, Department of Mathematics P.O. Box 35, SF-4351
More informationOn the p-laplacian and p-fluids
LMU Munich, Germany Lars Diening On the p-laplacian and p-fluids Lars Diening On the p-laplacian and p-fluids 1/50 p-laplacian Part I p-laplace and basic properties Lars Diening On the p-laplacian and
More informationto appear in the Journal of the European Mathematical Society THE WOLFF GRADIENT BOUND FOR DEGENERATE PARABOLIC EQUATIONS
to appear in the Journal of the European Mathematical Society THE WOLFF GRADIENT BOUND FOR DEGENERATE PARABOLIC EUATIONS TUOMO KUUSI AND GIUSEPPE MINGIONE Abstract. The spatial gradient of solutions to
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 informationSingular Integrals. 1 Calderon-Zygmund decomposition
Singular Integrals Analysis III Calderon-Zygmund decomposition Let f be an integrable function f dx 0, f = g + b with g Cα almost everywhere, with b
More informationGeometric intuition: from Hölder spaces to the Calderón-Zygmund estimate
Geometric intuition: from Hölder spaces to the Calderón-Zygmund estimate A survey of Lihe Wang s paper Michael Snarski December 5, 22 Contents Hölder spaces. Control on functions......................................2
More informationREGULARITY AND COMPARISON PRINCIPLES FOR p-laplace EQUATIONS WITH VANISHING SOURCE TERM. Contents
REGULARITY AND COMPARISON PRINCIPLES FOR p-laplace EQUATIONS WITH VANISHING SOURCE TERM BERARDINO SCIUNZI Abstract. We prove some sharp estimates on the summability properties of the second derivatives
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 informationSobolev Spaces. Chapter Hölder spaces
Chapter 2 Sobolev Spaces Sobolev spaces turn out often to be the proper setting in which to apply ideas of functional analysis to get information concerning partial differential equations. Here, we collect
More informationThe role of Wolff potentials in the analysis of degenerate parabolic equations
The role of Wolff potentials in the analysis of degenerate parabolic equations September 19, 2011 Universidad Autonoma de Madrid Some elliptic background Part 1: Ellipticity The classical potential estimates
More informationGRADIENT REGULARITY FOR NONLINEAR PARABOLIC EQUATIONS. To Emmanuele DiBenedetto on his 65th birthday
GRADIENT REGULARITY FOR NONLINEAR PARABOLIC EUATIONS TUOMO KUUSI AND GIUSEPPE MINGIONE To Emmanuele DiBenedetto on his 65th birthday Abstract. We consider non-homogeneous degenerate and singular parabolic
More informationIntegro-differential equations: Regularity theory and Pohozaev identities
Integro-differential equations: Regularity theory and Pohozaev identities Xavier Ros Oton Departament Matemàtica Aplicada I, Universitat Politècnica de Catalunya PhD Thesis Advisor: Xavier Cabré Xavier
More informationSUBELLIPTIC CORDES ESTIMATES
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 00, Number 0, Pages 000 000 S 000-9939XX0000-0 SUBELLIPTIC CORDES ESTIMATES Abstract. We prove Cordes type estimates for subelliptic linear partial
More informationDeng Songhai (Dept. of Math of Xiangya Med. Inst. in Mid-east Univ., Changsha , China)
J. Partial Diff. Eqs. 5(2002), 7 2 c International Academic Publishers Vol.5 No. ON THE W,q ESTIMATE FOR WEAK SOLUTIONS TO A CLASS OF DIVERGENCE ELLIPTIC EUATIONS Zhou Shuqing (Wuhan Inst. of Physics and
More informationLecture No 1 Introduction to Diffusion equations The heat equat
Lecture No 1 Introduction to Diffusion equations The heat equation Columbia University IAS summer program June, 2009 Outline of the lectures We will discuss some basic models of diffusion equations and
More informationCarleson Measures for Besov-Sobolev Spaces and Non-Homogeneous Harmonic Analysis
Carleson Measures for Besov-Sobolev Spaces and Non-Homogeneous Harmonic Analysis Brett D. Wick Georgia Institute of Technology School of Mathematics & Humboldt Fellow Institut für Mathematik Universität
More informationLORENTZ ESTIMATES FOR WEAK SOLUTIONS OF QUASI-LINEAR PARABOLIC EQUATIONS WITH SINGULAR DIVERGENCE-FREE DRIFTS TUOC PHAN
LORENTZ ESTIMATES FOR WEAK SOLUTIONS OF QUASI-LINEAR PARABOLIC EQUATIONS WITH SINGULAR DIVERGENCE-FREE DRIFTS TUOC PHAN Abstract This paper investigates regularity in Lorentz spaces for weak solutions
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 informationFractional superharmonic functions and the Perron method for nonlinear integro-differential equations
Fractional superharmonic functions and the Perron method for nonlinear integro-differential equations Janne Korvenpää Tuomo Kuusi Giampiero Palatucci Abstract We deal with a class of equations driven by
More informationThe De Giorgi-Nash-Moser Estimates
The De Giorgi-Nash-Moser Estimates We are going to discuss the the equation Lu D i (a ij (x)d j u) = 0 in B 4 R n. (1) The a ij, with i, j {1,..., n}, are functions on the ball B 4. Here and in the following
More informationGood Lambda Inequalities and Riesz Potentials for Non Doubling Measures in R n
Good Lambda Inequalities and Riesz Potentials for Non Doubling Measures in R n Mukta Bhandari mukta@math.ksu.edu Advisor Professor Charles Moore Department of Mathematics Kansas State University Prairie
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 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 informationA NOTE ON ZERO SETS OF FRACTIONAL SOBOLEV FUNCTIONS WITH NEGATIVE POWER OF INTEGRABILITY. 1. Introduction
A NOTE ON ZERO SETS OF FRACTIONAL SOBOLEV FUNCTIONS WITH NEGATIVE POWER OF INTEGRABILITY ARMIN SCHIKORRA Abstract. We extend a Poincaré-type inequality for functions with large zero-sets by Jiang and Lin
More informationTHE L 2 -HODGE THEORY AND REPRESENTATION ON R n
THE L 2 -HODGE THEORY AND REPRESENTATION ON R n BAISHENG YAN Abstract. We present an elementary L 2 -Hodge theory on whole R n based on the minimization principle of the calculus of variations and some
More informationGuide to Nonlinear Potential Estimates. T. Kuusi and G. Mingione. REPORT No. 2, 2013/2014, fall ISSN X ISRN IML-R /14- -SE+fall
Guide to Nonlinear Potential Estimates T. Kuusi and G. Mingione REPORT No. 2, 2013/2014, fall ISSN 1103-467X ISRN IML-R- -2-13/14- -SE+fall Dark Side paper manuscript No. (will be inserted by the editor)
More informationHOMEOMORPHISMS OF BOUNDED VARIATION
HOMEOMORPHISMS OF BOUNDED VARIATION STANISLAV HENCL, PEKKA KOSKELA AND JANI ONNINEN Abstract. We show that the inverse of a planar homeomorphism of bounded variation is also of bounded variation. In higher
More informationarxiv: v1 [math.ap] 25 Jul 2012
THE DIRICHLET PROBLEM FOR THE FRACTIONAL LAPLACIAN: REGULARITY UP TO THE BOUNDARY XAVIER ROS-OTON AND JOAQUIM SERRA arxiv:1207.5985v1 [math.ap] 25 Jul 2012 Abstract. We study the regularity up to the boundary
More informationGreen s Functions and Distributions
CHAPTER 9 Green s Functions and Distributions 9.1. Boundary Value Problems We would like to study, and solve if possible, boundary value problems such as the following: (1.1) u = f in U u = g on U, where
More informationOn Aleksandrov-Bakelman-Pucci Type Estimates For Integro-Differential Equations
On Aleksandrov-Bakelman-Pucci Type Estimates For Integro-Differential Equations Russell Schwab Carnegie Mellon University 2 March 2012 (Nonlocal PDEs, Variational Problems and their Applications, IPAM)
More informationINTEGRABILITY OF SUPERHARMONIC FUNCTIONS IN A JOHN DOMAIN. Hiroaki Aikawa
INTEGRABILITY OF SUPERHARMONIC FUNCTIONS IN A OHN OMAIN Hiroaki Aikawa Abstract. The integrability of positive erharmonic functions on a bounded fat ohn domain is established. No exterior conditions are
More informationRegularity of the p-poisson equation in the plane
Regularity of the p-poisson equation in the plane Erik Lindgren Peter Lindqvist Department of Mathematical Sciences Norwegian University of Science and Technology NO-7491 Trondheim, Norway Abstract We
More informationRegularity of local minimizers of the interaction energy via obstacle problems
Regularity of local minimizers of the interaction energy via obstacle problems J. A. Carrillo, M. G. Delgadino, A. Mellet September 22, 2014 Abstract The repulsion strength at the origin for repulsive/attractive
More informationTools from Lebesgue integration
Tools from Lebesgue integration E.P. van den Ban Fall 2005 Introduction In these notes we describe some of the basic tools from the theory of Lebesgue integration. Definitions and results will be given
More informationBoth these computations follow immediately (and trivially) from the definitions. Finally, observe that if f L (R n ) then we have that.
Lecture : One Parameter Maximal Functions and Covering Lemmas In this first lecture we start studying one of the basic and fundamental operators in harmonic analysis, the Hardy-Littlewood maximal function.
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 informationEXISTENCE AND REGULARITY RESULTS FOR SOME NONLINEAR PARABOLIC EQUATIONS
EXISTECE AD REGULARITY RESULTS FOR SOME OLIEAR PARABOLIC EUATIOS Lucio BOCCARDO 1 Andrea DALL AGLIO 2 Thierry GALLOUËT3 Luigi ORSIA 1 Abstract We prove summability results for the solutions of nonlinear
More informationBrunn-Minkowski inequality for the 1-Riesz capacity and level set convexity for the 1/2-Laplacian
Brunn-Minkowski inequality for the 1-Riesz capacity and level set convexity for the 1/2-Laplacian M. Novaga, B. Ruffini Abstract We prove that that the 1-Riesz capacity satisfies a Brunn-Minkowski inequality,
More informationHARNACK S INEQUALITY FOR GENERAL SOLUTIONS WITH NONSTANDARD GROWTH
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 37, 2012, 571 577 HARNACK S INEQUALITY FOR GENERAL SOLUTIONS WITH NONSTANDARD GROWTH Olli Toivanen University of Eastern Finland, Department of
More informationNOTE ON A REMARKABLE SUPERPOSITION FOR A NONLINEAR EQUATION. 1. Introduction. ρ(y)dy, ρ 0, x y
NOTE ON A REMARKABLE SUPERPOSITION FOR A NONLINEAR EQUATION PETER LINDQVIST AND JUAN J. MANFREDI Abstract. We give a simple proof of - and extend - a superposition principle for the equation div( u p 2
More informationPERTURBATION THEORY FOR NONLINEAR DIRICHLET PROBLEMS
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 28, 2003, 207 222 PERTURBATION THEORY FOR NONLINEAR DIRICHLET PROBLEMS Fumi-Yuki Maeda and Takayori Ono Hiroshima Institute of Technology, Miyake,
More informationarxiv: v1 [math.ap] 12 Mar 2009
LIMITING FRACTIONAL AND LORENTZ SPACES ESTIMATES OF DIFFERENTIAL FORMS JEAN VAN SCHAFTINGEN arxiv:0903.282v [math.ap] 2 Mar 2009 Abstract. We obtain estimates in Besov, Lizorkin-Triebel and Lorentz spaces
More informationNONLOCAL DIFFUSION EQUATIONS
NONLOCAL DIFFUSION EQUATIONS JULIO D. ROSSI (ALICANTE, SPAIN AND BUENOS AIRES, ARGENTINA) jrossi@dm.uba.ar http://mate.dm.uba.ar/ jrossi 2011 Non-local diffusion. The function J. Let J : R N R, nonnegative,
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 informationThe Dirichlet boundary problems for second order parabolic operators satisfying a Carleson condition
The Dirichlet boundary problems for second order parabolic operators satisfying a Carleson condition Sukjung Hwang CMAC, Yonsei University Collaboration with M. Dindos and M. Mitrea The 1st Meeting of
More informationRegularizations of Singular Integral Operators (joint work with C. Liaw)
1 Outline Regularizations of Singular Integral Operators (joint work with C. Liaw) Sergei Treil Department of Mathematics Brown University April 4, 2014 2 Outline 1 Examples of Calderón Zygmund operators
More informationOn some weighted fractional porous media equations
On some weighted fractional porous media equations Gabriele Grillo Politecnico di Milano September 16 th, 2015 Anacapri Joint works with M. Muratori and F. Punzo Gabriele Grillo Weighted Fractional PME
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 informationTD M1 EDP 2018 no 2 Elliptic equations: regularity, maximum principle
TD M EDP 08 no Elliptic equations: regularity, maximum principle Estimates in the sup-norm I Let be an open bounded subset of R d of class C. Let A = (a ij ) be a symmetric matrix of functions of class
More informationStochastic homogenization 1
Stochastic homogenization 1 Tuomo Kuusi University of Oulu August 13-17, 2018 Jyväskylä Summer School 1 Course material: S. Armstrong & T. Kuusi & J.-C. Mourrat : Quantitative stochastic homogenization
More informationBrunn-Minkowski inequality for the 1-Riesz capacity and level set convexity for the 1/2-Laplacian
Brunn-Minkowski inequality for the 1-Riesz capacity and level set convexity for the 1/2-Laplacian M. Novaga, B. Ruffini January 13, 2014 Abstract We prove that that the 1-Riesz capacity satisfies a Brunn-Minkowski
More informationA PDE VERSION OF THE CONSTANT VARIATION METHOD AND THE SUBCRITICALITY OF SCHRÖDINGER SYSTEMS WITH ANTISYMMETRIC POTENTIALS.
A PDE VERSION OF THE CONSTANT VARIATION METHOD AND THE SUBCRITICALITY OF SCHRÖDINGER SYSTEMS WITH ANTISYMMETRIC POTENTIALS. Tristan Rivière Departement Mathematik ETH Zürich (e mail: riviere@math.ethz.ch)
More informationRegularity Theory. Lihe Wang
Regularity Theory Lihe Wang 2 Contents Schauder Estimates 5. The Maximum Principle Approach............... 7.2 Energy Method.......................... 3.3 Compactness Method...................... 7.4 Boundary
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 informationThe optimal partial transport problem
The optimal partial transport problem Alessio Figalli Abstract Given two densities f and g, we consider the problem of transporting a fraction m [0, min{ f L 1, g L 1}] of the mass of f onto g minimizing
More informationIMPROVED SOBOLEV EMBEDDINGS, PROFILE DECOMPOSITION, AND CONCENTRATION-COMPACTNESS FOR FRACTIONAL SOBOLEV SPACES
IMPROVED SOBOLEV EMBEDDINGS, PROFILE DECOMPOSITION, AND CONCENTRATION-COMPACTNESS FOR FRACTIONAL SOBOLEV SPACES GIAMPIERO PALATUCCI AND ADRIANO PISANTE Abstract. We obtain an improved Sobolev inequality
More informationfür Mathematik in den Naturwissenschaften Leipzig
Max-Planck-Institut für Mathematik in den Naturwissenschaften Leipzig A short proof of the self-improving regularity of quasiregular mappings. by Xiao Zhong and Daniel Faraco Preprint no.: 106 2002 A
More informationNOTE ON A REMARKABLE SUPERPOSITION FOR A NONLINEAR EQUATION. 1. Introduction. ρ(y)dy, ρ 0, x y
NOTE ON A REMARKABLE SUPERPOSITION FOR A NONLINEAR EQUATION PETER LINDQVIST AND JUAN J. MANFREDI Abstract. We give a simple proof of - and extend - a superposition principle for the equation div( u p 2
More informationarxiv: v1 [math.ap] 9 Oct 2017
A refined estimate for the topological degree arxiv:70.02994v [math.ap] 9 Oct 207 Hoai-Minh Nguyen October 0, 207 Abstract We sharpen an estimate of [4] for the topological degree of continuous maps from
More informationHarmonic Analysis Homework 5
Harmonic Analysis Homework 5 Bruno Poggi Department of Mathematics, University of Minnesota November 4, 6 Notation Throughout, B, r is the ball of radius r with center in the understood metric space usually
More informationPartial Differential Equations, 2nd Edition, L.C.Evans Chapter 5 Sobolev Spaces
Partial Differential Equations, nd Edition, L.C.Evans Chapter 5 Sobolev Spaces Shih-Hsin Chen, Yung-Hsiang Huang 7.8.3 Abstract In these exercises always denote an open set of with smooth boundary. As
More informationLebesgue s Differentiation Theorem via Maximal Functions
Lebesgue s Differentiation Theorem via Maximal Functions Parth Soneji LMU München Hütteseminar, December 2013 Parth Soneji Lebesgue s Differentiation Theorem via Maximal Functions 1/12 Philosophy behind
More informationA GENERAL CLASS OF FREE BOUNDARY PROBLEMS FOR FULLY NONLINEAR ELLIPTIC EQUATIONS
A GENERAL CLASS OF FREE BOUNDARY PROBLEMS FOR FULLY NONLINEAR ELLIPTIC EQUATIONS ALESSIO FIGALLI AND HENRIK SHAHGHOLIAN Abstract. In this paper we study the fully nonlinear free boundary problem { F (D
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 informationTADAHIRO OH 0, 3 8 (T R), (1.5) The result in [2] is in fact stated for time-periodic functions: 0, 1 3 (T 2 ). (1.4)
PERIODIC L 4 -STRICHARTZ ESTIMATE FOR KDV TADAHIRO OH 1. Introduction In [], Bourgain proved global well-posedness of the periodic KdV in L T): u t + u xxx + uu x 0, x, t) T R. 1.1) The key ingredient
More informationRESTRICTED WEAK TYPE VERSUS WEAK TYPE
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 133, Number 4, Pages 1075 1081 S 0002-9939(04)07791-3 Article electronically published on November 1, 2004 RESTRICTED WEAK TYPE VERSUS WEAK TYPE
More informationOn the Brezis and Mironescu conjecture concerning a Gagliardo-Nirenberg inequality for fractional Sobolev norms
On the Brezis and Mironescu conjecture concerning a Gagliardo-Nirenberg inequality for fractional Sobolev norms Vladimir Maz ya Tatyana Shaposhnikova Abstract We prove the Gagliardo-Nirenberg type inequality
More informationA Hopf type lemma for fractional equations
arxiv:705.04889v [math.ap] 3 May 207 A Hopf type lemma for fractional equations Congming Li Wenxiong Chen May 27, 208 Abstract In this short article, we state a Hopf type lemma for fractional equations
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 informationSome lecture notes for Math 6050E: PDEs, Fall 2016
Some lecture notes for Math 65E: PDEs, Fall 216 Tianling Jin December 1, 216 1 Variational methods We discuss an example of the use of variational methods in obtaining existence of solutions. Theorem 1.1.
More informationRevista Matematica Iberoamericana 28 (2012) POTENTIAL ESTIMATES AND GRADIENT BOUNDEDNESS FOR NONLINEAR PARABOLIC SYSTEMS
Revista Matematica Iberoamericana 28 2012) 535-576 POTENTIAL ESTIMATES AND GRADIENT BOUNDEDNESS FOR NONLINEAR PARABOLIC SYSTEMS TUOMO KUUSI AND GIUSEPPE MINGIONE Abstract. We consider a class of parabolic
More informationSOLUTION OF POISSON S EQUATION. Contents
SOLUTION OF POISSON S EQUATION CRISTIAN E. GUTIÉRREZ OCTOBER 5, 2013 Contents 1. Differentiation under the integral sign 1 2. The Newtonian potential is C 1 2 3. The Newtonian potential from the 3rd Green
More informationVISCOSITY SOLUTIONS. We follow Han and Lin, Elliptic Partial Differential Equations, 5.
VISCOSITY SOLUTIONS PETER HINTZ We follow Han and Lin, Elliptic Partial Differential Equations, 5. 1. Motivation Throughout, we will assume that Ω R n is a bounded and connected domain and that a ij C(Ω)
More informationPOINCARÉ S INEQUALITY AND DIFFUSIVE EVOLUTION EQUATIONS
POINCARÉ S INEQUALITY AND DIFFUSIVE EVOLUTION EQUATIONS CLAYTON BJORLAND AND MARIA E. SCHONBEK Abstract. This paper addresses the question of change of decay rate from exponential to algebraic for diffusive
More informationA non-local critical problem involving the fractional Laplacian operator
Eduardo Colorado p. 1/23 A non-local critical problem involving the fractional Laplacian operator Eduardo Colorado Universidad Carlos III de Madrid UGR, Granada Febrero 212 Eduardo Colorado p. 2/23 Eduardo
More informationTHE HARDY LITTLEWOOD MAXIMAL FUNCTION OF A SOBOLEV FUNCTION. Juha Kinnunen. 1 f(y) dy, B(x, r) B(x,r)
Appeared in Israel J. Math. 00 (997), 7 24 THE HARDY LITTLEWOOD MAXIMAL FUNCTION OF A SOBOLEV FUNCTION Juha Kinnunen Abstract. We prove that the Hardy Littlewood maximal operator is bounded in the Sobolev
More informationBesov regularity of solutions of the p-laplace equation
Besov regularity of solutions of the p-laplace equation Benjamin Scharf Technische Universität München, Department of Mathematics, Applied Numerical Analysis benjamin.scharf@ma.tum.de joint work with Lars
More informationElementary Theory and Methods for Elliptic Partial Differential Equations. John Villavert
Elementary Theory and Methods for Elliptic Partial Differential Equations John Villavert Contents 1 Introduction and Basic Theory 4 1.1 Harmonic Functions............................... 5 1.1.1 Mean Value
More informationGlimpses on functionals with general growth
Glimpses on functionals with general growth Lars Diening 1 Bianca Stroffolini 2 Anna Verde 2 1 Universität München, Germany 2 Università Federico II, Napoli Minicourse, Mathematical Institute Oxford, October
More informationA 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 informationA NOTE ON WAVELET EXPANSIONS FOR DYADIC BMO FUNCTIONS IN SPACES OF HOMOGENEOUS TYPE
EVISTA DE LA UNIÓN MATEMÁTICA AGENTINA Vol. 59, No., 208, Pages 57 72 Published online: July 3, 207 A NOTE ON WAVELET EXPANSIONS FO DYADIC BMO FUNCTIONS IN SPACES OF HOMOGENEOUS TYPE AQUEL CESCIMBENI AND
More informationTHE OBSTACLE PROBLEM FOR NONLINEAR INTEGRO-DIFFERENTIAL OPERATORS
THE OBSTACLE PROBLEM FOR NONLINEAR INTEGRO-DIFFERENTIAL OPERATORS JANNE KORVENPÄÄ, TUOMO KUUSI, AND GIAMPIERO PALATUCCI Abstract. We investigate the obstacle problem for a class of nonlinear equations
More informationHERMITE MULTIPLIERS AND PSEUDO-MULTIPLIERS
PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY Volume 124, Number 7, July 1996 HERMITE MULTIPLIERS AND PSEUDO-MULTIPLIERS JAY EPPERSON Communicated by J. Marshall Ash) Abstract. We prove a multiplier
More informationfor all subintervals I J. If the same is true for the dyadic subintervals I D J only, we will write ϕ BMO d (J). In fact, the following is true
3 ohn Nirenberg inequality, Part I A function ϕ L () belongs to the space BMO() if sup ϕ(s) ϕ I I I < for all subintervals I If the same is true for the dyadic subintervals I D only, we will write ϕ BMO
More informationA class of domains with fractal boundaries: Functions spaces and numerical methods
A class of domains with fractal boundaries: Functions spaces and numerical methods Yves Achdou joint work with T. Deheuvels and N. Tchou Laboratoire J-L Lions, Université Paris Diderot École Centrale -
More informationMODULUS AND CONTINUOUS CAPACITY
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 26, 2001, 455 464 MODULUS AND CONTINUOUS CAPACITY Sari Kallunki and Nageswari Shanmugalingam University of Jyväskylä, Department of Mathematics
More informationRégularité des équations de Hamilton-Jacobi du premier ordre et applications aux jeux à champ moyen
Régularité des équations de Hamilton-Jacobi du premier ordre et applications aux jeux à champ moyen Daniela Tonon en collaboration avec P. Cardaliaguet et A. Porretta CEREMADE, Université Paris-Dauphine,
More informationFree boundaries in fractional filtration equations
Free boundaries in fractional filtration equations Fernando Quirós Universidad Autónoma de Madrid Joint work with Arturo de Pablo, Ana Rodríguez and Juan Luis Vázquez International Conference on Free Boundary
More informationFRACTIONAL SOBOLEV SPACES WITH VARIABLE EXPONENTS AND FRACTIONAL P (X)-LAPLACIANS. 1. Introduction
FRACTIONAL SOBOLEV SPACES WITH VARIABLE EXPONENTS AND FRACTIONAL P (X-LAPLACIANS URIEL KAUFMANN, JULIO D. ROSSI AND RAUL VIDAL Abstract. In this article we extend the Sobolev spaces with variable exponents
More information