Weighted a priori estimates for elliptic equations
|
|
- Jeffry Ellis
- 6 years ago
- Views:
Transcription
1 arxiv: v [math.ap] Nov 07 Weighted a priori estimates for elliptic equations María E. Cejas Departamento de Matemática Facultad de Ciencias Exactas Universidad Nacional de La Plata CONICET Calle 50 y 5, 900 La Plata, uenos Aires, Argentina mec.eugenia@gmail.com Ricardo G. Durán Departamento de Matemática Facultad de Ciencias Exactas y Naturales Universidad de uenos Aires IMAS-CONICET-UA Pabellón I, Ciudad Universitaria, 48, CAA, Argentina rduran@dm.uba.ar Abstract We give a simpler proof of the a priori estimates obtained in [DST, DST] for solutions of elliptic problems in weighted Sobolev norms when the weights belong to the Muckenhoupt class A p. The argument is a generalization to bounded domains of the one used in R n to prove the continuity of singular integral operators in weighted norms. In the case of singular integral operators it is known that the A p condition is also necessary for the continuity. We do not know whetherthisisalsotruefortheaprioriestimatesinboundeddomains but we are able to prove a weaker result when the operator is the Laplacian or a power of it. We prove that a necessary condition is that the weight belongs to the local A p class. 00 Mathematics Subject Classification: Primary 3545; Secondary 40. Key words and phrases: Elliptic equations, weighted a priori estimates. 3
2 M.E. Cejas and R.G. Durán Introduction The goal of this paper is to prove weighted a priori estimates for solutions of linear elliptic problems with Dirichlet boundary conditions. More precisely, for a bounded smooth domain R n we consider { Lu = f in j u = 0 on, j m where L is an elliptic operator of order m and j differential operators of order m j satisfying the properties introduced in the classic paper [ADN]. For < p <, the a priori estimate (.) u W m,p () C f L p (). is well-known. This result is usually referred as Agmon-Douglis-Nirenberg estimate because it is essentially contained in [ADN] although it is not explicitly written in this way in that paper. For completeness we give more details on this point in the next section. The estimate (.) has been extended to weighted norms when L is the Laplacian or a power of it in [DST, DST]. y a weight function we mean a locally integrable function w defined in R n and for p <, we define the anach space L p w() with norm given by ( /p f L p w () = f(x) w(x)dx) p. and Ww m,p () the Sobolev space of functions in L p w() with derivatives up to order m in L p w() with the usual norm. For = R n we write simply L p w instead of Lp w (Rn ). With C we will denote a generic constant which can change its value even in the same line. For < p <, a weight is in the Muckenhoupt class A p if (.) ( )( p w w p ) C Q Q Q Q for all cubes Q. It is well known that the Hardy-Littlewood maximal operator is bounded in L p w if and only if w A p (see for example [D]). ForL = ( ) m it was proved in[dst] (extending the results for m = given in [DST]) that, if w is in A p, then (.3) u W m,p w () C f L p w(),
3 Weighted a priori estimates 3 In this paper we give a different proof of (.3) generalizing to a bounded domain the classic arguments used to obtain the continuity of singular integral operators in L p w. The advantage of this proof is that it is simpler and it does not require estimates of derivatives of the Green function involving the distance to the boundary. On the other hand, our arguments are very general and apply to the class of operators considered in [ADN, K]. We do not know whether the A p condition is also necessary to have (.3) but we prove a weaker result for the case of L = ( ) m. Indeed, in order to have the a priori estimate (.3) it is necessary that w A loc p () (see below for the definition of this class). Weighted a priori estimates For a bounded domain R n we consider the problem Lu(x) := a α (x)d α u(x) = f(x) in (.) 0 α m j u(x) := 0 α m j b jα (x)d α u(x) = 0 on j m where L is uniformly elliptic and j satisfy the complementing conditions in the sense of [ADN]. Our arguments are based on the estimates for the Green function of (.) proved in [K], and therefore, we assume the hypotheses of that paper. Namely, m j m and, for l 0 := max j (m m j ), let l be an integer such that (.) l 3 l 0, for n 3 l (l 0 +), for n =. Then, (.3) a α C l + () b jα C l + ( ) and (.4) C l +m+ Under these assumptions, the existence of the Green function as well as estimates for it and its derivatives were proved in [K]. We state in the next theorem the estimates that we are going to use in our arguments.
4 4 M.E. Cejas and R.G. Durán Theorem.. Under the hypotheses (.), (.3) and (.4) there exists the Green function G of (.), namely, the solution u is given by (.5) u(x) = G(x,y)f(y)dy. Moreover, for 0 < α <, there exists a constant C depending on L, j, and n such that (.6) γ m, m n γ 0 = D γ x G(x,y) C{ x y m n γ + } (.7) m n γ = 0 = Dx γ G(x,y) C{ log x y +} (.8) γ = m = D γ x G(y,z) Dγ x G(x,z) C y x α( y z n α + x z n α). Proof. See Theorem 3.3 and its Corollary in [K, Page 965]. Our proof of the weighted a priori estimates makes use of the classic unweighted results. As we mentioned in the introduction, the a priori estimate (.) is essentially contained in [ADN] although not written explicitly there. Indeed, in the particular case of homogeneous boundary conditions that we are considering, Theorem 5. in page 704 of [ADN] says that u W m,p () C { f L p () + u L p ()}. ut, in view of the representation (.5) and the bound for G given in (.6), a standard application of the Young inequality yields u L p () C f L p (), and therefore, (.) follows. Let us remark that in the above mentioned Theorem 5. of [ADN] the authors assume that the norm on the left hand side of the estimate is finite, but this follows from their previous Theorem 7.3 (see also Remark after that theorem) [ADN, Page 668] provided f is regular enough and using again the representation (.5) to bound the norm of u appearing in the right hand side of that theorem. Then, in the general case one can proceed by a standard density argument. Let us now recall the argument used in the case of singular integral operators that we are going to generalize. We will make use of the Hardy- Littlewood maximal operator Mf(x) = sup f(y) dy Q x Q Q
5 Weighted a priori estimates 5 and of the sharp maximal operator M # f(x) = sup Q x Q Q f(y) f Q dy, where the supremums are taken over all cubes containing x and f Q := f. Q Q If Tf(x) = lim K(x, y)f(y)dy ε 0 x y >ε is a singular integral operator which is continuous in L p, for < p <, and K(x, y) satisfies K(x,z) K(y,z) C x y α x z n+α, for x z x y with 0 < α <, then we have, for any s >, (.9) M # Tf(x) C(M f s (x)) /s. This estimate is well-known and its proof can be found in several books, althoughthehypotheses ontheoperatorarenotstatedusually aswe aredoing here. Indeed, the proofgiven in[d, Lemma 7.9] only uses thehypotheses given above. In the next lemma we prove a version of (.9) in a bounded domain. With this goal we introduce the local sharp maximal operator M # f(x) = sup f(y) f Q dy. Q x Q Lemma.. Let u be the solution of (.) and assume that the hypotheses of Theorem. are satisfied. If γ = m we have, for any s > and any x, M # (Dγ u)(x) C(M f s ) /s (x). Proof. We extend f by zero outside of. Let Q be a cube such that x Q and Q an expanded cube of Q by a factor. We decompose f = f +f with f = fχ Q and call u and u the solutions of (.) with f and f as right hand sides respectively. It is known that we can replace f Q by any constant. We choose a = D γ u (x). Then, Q Q D γ u(y) a dy Q Q Q D γ u (y) dy+ D γ u (y) D γ u (x) dy = (i)+(ii). Q Q
6 6 M.E. Cejas and R.G. Durán Now, given s >, using the Hölder inequality and (.), we have ( /s ( ) /s (i) D γ u (y) dy) s C f (y) s dy Q Q Q ( ) /s = C f(y) s dy C(M f s ) /s (x). Q Q On the other hand, if x / suppf we can take the derivative inside the integral in the expression for u given by (.5). Then, since suppf (Q ) c, for x Q we have (ii) Q Q (Q ) c D γ xg(y,z) D γ xg(x,z) f (z) dzdy. Therefore, using (.8) and that y z x z and x z l(q) we obtain (ii) C l(q)α f(z) dzdy Cl(Q)α Q Q (Q ) x z c n+α Cl(Q) α k=0 k l(q)< z x k l(q) f(z) dz (Q ) x z c n+α f(z) dz CMf(x) x z n+α where the last inequality follows by a standard argument (see [D, Lemma 7.9] for details). The following Lemma is a slightly modified version of [DRS, Theorem 5.3] because we are using a different definition of the sharp maximal operator. The reader can easily check that the proof given in that paper applies to our case. Lemma.3. For f L loc () and w A p, if f = f, then (.0) f f L p w () C M # f L p w(). Now we can state and prove the main result of this section. Theorem.4. Let u be the solution of (.) and assume that the hypotheses of Theorem. are satisfied. Then, for < p <, w A p and f L p w(), there exists a constant C depending on L, j,, n and w such that u W m,p w () C f L p w().
7 Weighted a priori estimates 7 Proof. If m n < γ < m, using (.5) and (.6) we obtain D γ u(x) = Dx γ G(x,y)f(y)dy f(y) C dy x y γ +n m f(y) C dy CMf(x) x y γ +n m k=0 (k+) d< x y k d where d denotes the diameter of. For γ m n we obtain the same estimate using now that, in view(.6) and (.7), for any ε > 0, G(x,y) C x y ε. Consequently, it follows from the boundedness of the maximal operator for A p weights that u W m,p w () C f L p w(). It rests to estimate D γ u for γ = m which is the most difficult part. From Lemmas.3 and. we have (.) D γ u(x) (D γ u) p w(x)dx C C M # (Dγ u)(x) p w(x)dx (M f s (x)) p/s w(x)dx. ut it is known that there exists s depending only on w such that < s < p and w A p/s (see for example [D]), and using the boundedness of M in L p/s w we obtain from (.), D γ u(x) (D γ u) p w(x)dx C f(x) p w(x)dx. Then, ( ) D γ u(x) p w(x)dx C f(x) p w(x)dx+ (D γ u) p w(x)dx and so it only remains to estimate the last term. ut, since w is integrable in, it is enough to show that (.) (D γ u) C f L p w (). Taking < s < p and using the a priori estimate (.) for s we have ( ) ( ) (D γ u) (D γ u) s s dx C f(x) s s dx ( ) ( C f(x) p p w(x)dx where we have used the Hölder inequality first with s and then with p/s. Then, choosing s such that w A p/s the last term on the right hand side is finite, and therefore, (.) is proved. )p s w(x) s sp p s dx
8 8 M.E. Cejas and R.G. Durán 3 Necessary condition It is known that the A p condition is also necessary for the continuity of singular integral operators [S]. Then, it is natural to ask whether the same is true for the weighted a priori estimates. We do not know the answer but we prove in this section a weaker result, namely, a necessary condition to have the weighted a priori estimates for L = ( ) m is that the weight belong to the A loc p () class extensively studied in [HSV]. In this section it is more convenient to work with balls instead of cubes. To recall the definition of the A loc p class, first we consider 0 < β < and define the A β p () class as follows. A weight w belongs to this class if ( )( p w w p ) C for all balls such that diam() < βdist(, ). It was proved in [HSV] that the classes A β p () are independent of β, namely, if 0 < β < and 0 < γ <, we have that w A β p () if and only if w Aγ p (). In view of this fact, we say that w A loc p () if w Aβ p () for some 0 < β <. We will call a ball satisfying this condition for some β, admissible. To simplify notation, we will use the usual notation w(s) = w(x)dx. S Proposition 3.. Let w be a weight. Then, w A loc p () if and only if (3.) (f ) p C f p wdx w() for all f nonnegative and for all admissible ball. Proof. The proof follows as in the case of the A p weights given in [S, Chapter V, Section.4] and [D, Theorem 7.] using the results in [HSV] and considering admissible balls. Let f L p w () and consider the homogeneous boundary value problem (3.) ( ) m u = f in ( ) j u = 0 on, j m ν then (3.3) u(x) = G m (x,y)f(y)dy
9 Weighted a priori estimates 9 where G m (x,y) is the Green function of the operator ( ) m in. It is well known that G m (x,y) = Γ(x y)+h(x,y) where Γ is the fundamental solution given by { cm,n x m n n odd, or n even and n > m c m,n x m n log x and, for each y, h(x,y) satisfies ( x ) m h(x,y) = 0 n even and n m x ( ) j ( ) j h(x,y) = Γ(x y) x, 0 j m. ν ν Let us recall that, for γ = m, a standard argument yields (3.4) Dx γ Γ(x y)f(y)dy = lim D ε 0 x y >ǫ γ Γ(x y)f(y)dy+c(x)f(x) where c is a bounded function. We will use the ideas given in [S, Chapter V, Section 4.6]. Lemma 3.. For γ = m we have. There exists u 0 R n with u 0 = and a constant C 0 such that, for all positive numbers t, D γ Γ(tu 0 ) C 0 t n.. There exists t 0 such that if u = t 0 u 0 and v then for all 0 r R, D γ Γ(r(u+v)) D γ Γ(ru) Dγ Γ(ru). Proof. One can check that D γ Γ is homogeneous of degree n and not identically zero. Then, there exists u 0 R n with u 0 = such that D γ Γ(u 0 ) =: C 0 > 0, and therefore, () follows from the homogeneity. To prove () we observe first that, by homogeneity, it is enough to show that the statement holds for r =. Take v R n satisfying v k u with k to be chosen below. Then, for some ξ in the segment joining u and u+v, D γ Γ(u+v) D γ Γ(u) D γ Γ(ξ) v C ξ n v
10 0 M.E. Cejas and R.G. Durán and using u ξ, v k u and () we obtain, D γ Γ(u+v) D γ Γ(u) C k u n C k C 0 D γ Γ(u). Consequently itisenoughtochoosek suchthat C C 0 k.now, since v, if we choose t 0 = our hypothesis v k u is verified and the proof is k concluded. The following result is proved in ([DST, Proposition 3.3]). Lemma 3.3. There exists a constant C such that, for x y d(x), D γ x h(x,y) Cd(x) n. Now, using the representation (3.3) and (3.4), we have (3.5) D γ u(x) = T γ f(x)+c(x)u(x) where T γ is defined by T γ f(x) = lim D ε 0 x y >ǫ γ Γ(x y)f(y)dy+ We can now prove the main result of this section. D γ x h(x,y)f(y)dy. Theorem 3.4. Let u be the solution of (3.). If w is a weight such that the following a priori estimate holds, then w A loc p (). u W m,p w () C f L p w() Proof. In view of (3.5), since c is a bounded function, it is enough to prove that, if for any γ such that γ = m, then w A loc p (). We write T γ = T +T where T γ f L p w () C f L p w () T f(x) = lim D ε 0 x y >ǫ γ Γ(x y)f(y)dy and T f(x) = Dx γ h(x,y)f(y)dy.
11 Weighted a priori estimates Consider an admissible ball = ( x,r), i.e., r < βdist(, ), with β to be determined later and := ( x+ru,r), with u = t 0 u 0 as in Lemma 3.. We will see that β can be taken so that is also admissible. Let x and z then x = x+ru+rx with x, x z x z r u+x dist(, ) r u+x r β r u+x ( r β t ) 0 +, so, taking β satisfying β (t 0+) >, i.e. β < t 0 +3 and α = β (t 0+), we have r < αdist(, ). Now, we will show that for x and y, D γ Γ(x y) has constant sign. Indeed, writing x = x+ru+rx and y = x+ry with x, y, we have x y = ru+rv with v = x y. Then, by () from Lemma 3. we obtain, for D γ Γ(ru) > 0, (3.6) while for D γ Γ(ru) < 0 (3.7) Dγ Γ(ru) D γ Γ(x y) 3 Dγ Γ(ru), 3 Dγ Γ(ru) D γ Γ(x y) Dγ Γ(ru). Consequently, taking f C0 () positive, we have T f(x) = D γ Γ(x y) f(y)dy. and moreover, using (3.6), (3.7) and property () of Lemma 3., T f(x) D γ Γ(ru) f(y)dy C 0 (rt 0 ) n f(y)dy = C f. with a constant C depending only on t 0, C 0 and n. On the other hand, in order to bound T f(x) we use Lemma 3.3. We require x y d(x), but, x y = ru+r(x y ) r( u + x y ) r(t 0 +) < α d(x)(t 0 +) and then, we need α(t 0 + ) < or equivalently β < t 0. Now, we have +3 that T f(x) Dx γ h(x,y) f(y)dy C d(x) n f(y)dy C(r) n α n f(y)dy = C α n f.
12 M.E. Cejas and R.G. Durán where C is the constant appearing in Lemma 3.3 and C depends on n and C. Summing up we have T γ f(x) (C C α n )f. In order to have C C α n > 0 it is enough that β < t ( C ) n C { Takingintoaccounttheotherconditionsforβ wechooseβ < min and then, we obtain f C T γ f(x), for any x. Therefore, f p w(x)dx C T γ f(x) p w(x)dx C T γ f(x) p w(x)dx and consequently, applying the continuity of T γ in L p w, we obtain (3.8) (f ) p w( ) C f(x) p w(x)dx., t 0 +3 t 0 + Analogously, changing roles of and and taking f with support in, it follows that (3.9) (f ) p w() C f(x) p w(x)dx. provided that C C β n > 0. ut this inequality holds for our previous election of β because β < α. y a passage to the limit, the inequalities (3.8) and (3.9) extend to any non-negative function f supported in or respectively. If we consider f = χ in (3.9) we obtain w() Cw( ). +( C ) n C }, Using this in (3.8) we get (f ) p w() C f(x) p w(x)dx but, by Proposition 3., this means that w A loc p (). Acknowledgements This research was supported by Universidad de uenos Aires under grant and by ANPCyT, Argentina, under grant PICT The results of this paper are part of the doctoral thesis of the first author which was done under a fellowship granted by CONICET, Argentina. We thank the anonymous referee for helpful comments that led us to improve the previous version of this work.
13 Weighted a priori estimates 3 References [ADN] S. Agmon, A. Douglis and L. Nirenberg, Estimates near the boundary for solutions of elliptic partial differential equations satisfying general boundary conditions. I, Comm. Pure Appl. Math (959), [DRS] L. Diening, M. Ružicka, K. Schumacher, A decomposition technique for John domains, Ann. Acad. Sci. Fenn. Math 35 (00), [D] J. Duoandikoetxea, Fourier Analysis, Graduate Studies in Mathematics 9 AMS, Providence, RI, (00). [DST] R.G. Durán, M. Sanmartino and M. Toschi, Weighted a priori estimates for Poisson equation, Indiana University Math. Journal. 57, (008), [DST] R.G. Durán, M. Sanmartino and M. Toschi, Weighted a priori estimates for the solution of the homogeneous Dirichlet problem for powers of the Laplacian Operator, Analysis in Theory and Applications, 6(4),(00) [FS] C. Fefferman and E.M. Stein, H p spaces of several variables Acta Math. 9 (97), no. 3-4, [K] J.P.Krasovskii, Isolation of the singularity in Green s function, (Russian) Izv.Akad. Nauk SSSR Ser. Mat. 3 (967) [M]. Muckenhoupt, Weighted norm inequalities for the Hardy maximal function, Trans. Amer. Math. Soc. 65 (97), [HSV] E. Harboure, O. Salinas and. Viviani, Local maximal function and weights in a general setting, Math. Ann. 358 (04), no. 3-4, [S] E.M. Stein, Harmonic Analysis: Real variable-methods, ortogonality, and oscillatory integrals, Princeton Univ. Press, 993.
M ath. Res. Lett. 16 (2009), no. 1, c International Press 2009
M ath. Res. Lett. 16 (2009), no. 1, 149 156 c International Press 2009 A 1 BOUNDS FOR CALDERÓN-ZYGMUND OPERATORS RELATED TO A PROBLEM OF MUCKENHOUPT AND WHEEDEN Andrei K. Lerner, Sheldy Ombrosi, and Carlos
More informationOn pointwise estimates for maximal and singular integral operators by A.K. LERNER (Odessa)
On pointwise estimates for maximal and singular integral operators by A.K. LERNER (Odessa) Abstract. We prove two pointwise estimates relating some classical maximal and singular integral operators. In
More informationWEAK TYPE ESTIMATES FOR SINGULAR INTEGRALS RELATED TO A DUAL PROBLEM OF MUCKENHOUPT-WHEEDEN
WEAK TYPE ESTIMATES FOR SINGULAR INTEGRALS RELATED TO A DUAL PROBLEM OF MUCKENHOUPT-WHEEDEN ANDREI K. LERNER, SHELDY OMBROSI, AND CARLOS PÉREZ Abstract. A ell knon open problem of Muckenhoupt-Wheeden says
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 informationSHARP L p WEIGHTED SOBOLEV INEQUALITIES
Annales de l Institut de Fourier (3) 45 (995), 6. SHARP L p WEIGHTED SOBOLEV INEUALITIES Carlos Pérez Departmento de Matemáticas Universidad Autónoma de Madrid 28049 Madrid, Spain e mail: cperezmo@ccuam3.sdi.uam.es
More informationON WEIGHTED INEQUALITIES FOR FRACTIONAL INTEGRALS OF RADIAL FUNCTIONS. dy, 0 < γ < n. x y
ON WEIGHTED INEQUALITIES FOR FRACTIONAL INTEGRALS OF RADIAL FUNCTIONS PABLO L. DE NÁPOLI, IRENE DRELICHMAN, AND RICARDO G. DURÁN Abstract. We prove a weighted version of the Hardy-Littlewood-Sobolev inequality
More informationarxiv: v1 [math.ca] 29 Dec 2018
A QUANTITATIVE WEIGHTED WEAK-TYPE ESTIMATE FOR CALDERÓN-ZYGMUND OPERATORS CODY B. STOCKDALE arxiv:82.392v [math.ca] 29 Dec 208 Abstract. The purpose of this article is to provide an alternative proof of
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 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 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 informationWavelets and modular inequalities in variable L p spaces
Wavelets and modular inequalities in variable L p spaces Mitsuo Izuki July 14, 2007 Abstract The aim of this paper is to characterize variable L p spaces L p( ) (R n ) using wavelets with proper smoothness
More informationON HÖRMANDER S CONDITION FOR SINGULAR INTEGRALS
EVISTA DE LA UNIÓN MATEMÁTICA AGENTINA Volumen 45, Número 1, 2004, Páginas 7 14 ON HÖMANDE S CONDITION FO SINGULA INTEGALS M. LOENTE, M.S. IVEOS AND A. DE LA TOE 1. Introduction In this note we present
More informationJordan Journal of Mathematics and Statistics (JJMS) 9(1), 2016, pp BOUNDEDNESS OF COMMUTATORS ON HERZ-TYPE HARDY SPACES WITH VARIABLE EXPONENT
Jordan Journal of Mathematics and Statistics (JJMS 9(1, 2016, pp 17-30 BOUNDEDNESS OF COMMUTATORS ON HERZ-TYPE HARDY SPACES WITH VARIABLE EXPONENT WANG HONGBIN Abstract. In this paper, we obtain the boundedness
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 informationWeighted restricted weak type inequalities
Weighted restricted weak type inequalities Eduard Roure Perdices Universitat de Barcelona Joint work with M. J. Carro May 18, 2018 1 / 32 Introduction Abstract We review classical results concerning the
More informationSOBOLEV S INEQUALITY FOR RIESZ POTENTIALS OF FUNCTIONS IN NON-DOUBLING MORREY SPACES
Mizuta, Y., Shimomura, T. and Sobukawa, T. Osaka J. Math. 46 (2009), 255 27 SOOLEV S INEQUALITY FOR RIESZ POTENTIALS OF FUNCTIONS IN NON-DOULING MORREY SPACES YOSHIHIRO MIZUTA, TETSU SHIMOMURA and TAKUYA
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 informationBorderline variants of the Muckenhoupt-Wheeden inequality
Borderline variants of the Muckenhoupt-Wheeden inequality Carlos Domingo-Salazar Universitat de Barcelona joint work with M Lacey and G Rey 3CJI Murcia, Spain September 10, 2015 The Hardy-Littlewood maximal
More informationThe Dirichlet problem for non-divergence parabolic equations with discontinuous in time coefficients in a wedge
The Dirichlet problem for non-divergence parabolic equations with discontinuous in time coefficients in a wedge Vladimir Kozlov (Linköping University, Sweden) 2010 joint work with A.Nazarov Lu t u a ij
More informationON BOUNDEDNESS OF MAXIMAL FUNCTIONS IN SOBOLEV SPACES
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 29, 2004, 167 176 ON BOUNDEDNESS OF MAXIMAL FUNCTIONS IN SOBOLEV SPACES Piotr Haj lasz and Jani Onninen Warsaw University, Institute of Mathematics
More informationConjugate Harmonic Functions and Clifford Algebras
Conjugate Harmonic Functions and Clifford Algebras Craig A. Nolder Department of Mathematics Florida State University Tallahassee, FL 32306-450, USA nolder@math.fsu.edu Abstract We generalize a Hardy-Littlewood
More informationJordan Journal of Mathematics and Statistics (JJMS) 5(4), 2012, pp
Jordan Journal of Mathematics and Statistics (JJMS) 5(4), 2012, pp223-239 BOUNDEDNESS OF MARCINKIEWICZ INTEGRALS ON HERZ SPACES WITH VARIABLE EXPONENT ZONGGUANG LIU (1) AND HONGBIN WANG (2) Abstract In
More informationarxiv: v1 [math.ap] 18 May 2017
Littlewood-Paley-Stein functions for Schrödinger operators arxiv:175.6794v1 [math.ap] 18 May 217 El Maati Ouhabaz Dedicated to the memory of Abdelghani Bellouquid (2/2/1966 8/31/215) Abstract We study
More informationNECESSARY CONDITIONS FOR WEIGHTED POINTWISE HARDY INEQUALITIES
NECESSARY CONDITIONS FOR WEIGHTED POINTWISE HARDY INEQUALITIES JUHA LEHRBÄCK Abstract. We establish necessary conditions for domains Ω R n which admit the pointwise (p, β)-hardy inequality u(x) Cd Ω(x)
More informationOne basic result for this operator is the Stein-Weiss inequality, which gives its behaviour in Lebesgue spaces with power weights: α γ s n
WEIGHTED INEQUALITIES FOR THE FRACTIONAL LAPLACIAN AND THE EXISTENCE OF EXTREMALS arxiv:705.00030v2 [math.ap] 9 Feb 208 PABLO DE NÁPOLI, IRENE DRELICHMAN, AND ARIEL SALORT Abstract. In this article we
More informationarxiv:math/ v2 [math.ap] 3 Oct 2006
THE TAYLOR SERIES OF THE GAUSSIAN KERNEL arxiv:math/0606035v2 [math.ap] 3 Oct 2006 L. ESCAURIAZA From some people one can learn more than mathematics Abstract. We describe a formula for the Taylor series
More informationRemarks on localized sharp functions on certain sets in R n
Monatsh Math (28) 85:397 43 https://doi.org/.7/s65-7-9-5 Remarks on localized sharp functions on certain sets in R n Jacek Dziubański Agnieszka Hejna Received: 7 October 26 / Accepted: August 27 / Published
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 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 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 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 informationSome functional inequalities in variable exponent spaces with a more generalization of uniform continuity condition
Int. J. Nonlinear Anal. Appl. 7 26) No. 2, 29-38 ISSN: 28-6822 electronic) http://dx.doi.org/.2275/ijnaa.26.439 Some functional inequalities in variable exponent spaces with a more generalization of uniform
More informationHardy spaces associated to operators satisfying Davies-Gaffney estimates and bounded holomorphic functional calculus.
Hardy spaces associated to operators satisfying Davies-Gaffney estimates and bounded holomorphic functional calculus. Xuan Thinh Duong (Macquarie University, Australia) Joint work with Ji Li, Zhongshan
More informationON A MAXIMAL OPERATOR IN REARRANGEMENT INVARIANT BANACH FUNCTION SPACES ON METRIC SPACES
Vasile Alecsandri University of Bacău Faculty of Sciences Scientific Studies and Research Series Mathematics and Informatics Vol. 27207), No., 49-60 ON A MAXIMAL OPRATOR IN RARRANGMNT INVARIANT BANACH
More informationIn this work we consider mixed weighted weak-type inequalities of the form. f(x) Mu(x)v(x) dx, v(x) : > t C
MIXED WEAK TYPE ESTIMATES: EXAMPLES AND COUNTEREXAMPLES RELATED TO A PROBLEM OF E. SAWYER S.OMBROSI AND C. PÉREZ Abstract. In this paper we study mixed weighted weak-type inequalities for families of functions,
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 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 informationON APPROXIMATE DIFFERENTIABILITY OF THE MAXIMAL FUNCTION
ON APPROXIMATE DIFFERENTIABILITY OF THE MAXIMAL FUNCTION PIOTR HAJ LASZ, JAN MALÝ Dedicated to Professor Bogdan Bojarski Abstract. We prove that if f L 1 R n ) is approximately differentiable a.e., then
More informationHardy-Littlewood maximal operator in weighted Lorentz spaces
Hardy-Littlewood maximal operator in weighted Lorentz spaces Elona Agora IAM-CONICET Based on joint works with: J. Antezana, M. J. Carro and J. Soria Function Spaces, Differential Operators and Nonlinear
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 information(b) If f L p (R), with 1 < p, then Mf L p (R) and. Mf L p (R) C(p) f L p (R) with C(p) depending only on p.
Lecture 3: Carleson Measures via Harmonic Analysis Much of the argument from this section is taken from the book by Garnett, []. The interested reader can also see variants of this argument in the book
More informationVECTOR A 2 WEIGHTS AND A HARDY-LITTLEWOOD MAXIMAL FUNCTION
VECTOR A 2 WEIGHTS AND A HARDY-LITTLEWOOD MAXIMAL FUNCTION MICHAEL CHRIST AND MICHAEL GOLDBERG Abstract. An analogue of the Hardy-Littlewood maximal function is introduced, for functions taking values
More informationarxiv: v3 [math.ap] 1 Sep 2017
arxiv:1603.0685v3 [math.ap] 1 Sep 017 UNIQUE CONTINUATION FOR THE SCHRÖDINGER EQUATION WITH GRADIENT TERM YOUNGWOO KOH AND IHYEOK SEO Abstract. We obtain a unique continuation result for the differential
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 informationOSCILLATORY SINGULAR INTEGRALS ON L p AND HARDY SPACES
POCEEDINGS OF THE AMEICAN MATHEMATICAL SOCIETY Volume 24, Number 9, September 996 OSCILLATOY SINGULA INTEGALS ON L p AND HADY SPACES YIBIAO PAN (Communicated by J. Marshall Ash) Abstract. We consider boundedness
More informationATOMIC DECOMPOSITIONS AND OPERATORS ON HARDY SPACES
REVISTA DE LA UNIÓN MATEMÁTICA ARGENTINA Volumen 50, Número 2, 2009, Páginas 15 22 ATOMIC DECOMPOSITIONS AND OPERATORS ON HARDY SPACES STEFANO MEDA, PETER SJÖGREN AND MARIA VALLARINO Abstract. This paper
More informationNonhomogeneous Neumann problem for the Poisson equation in domains with an external cusp
J. Math. Anal. Appl. 31 (5) 397 411 www.elsevier.com/locate/jmaa Nonhomogeneous Neumann problem for the Poisson equation in domains with an external cusp Gabriel Acosta a,1, María G. Armentano b,,, Ricardo
More informationV. CHOUSIONIS AND X. TOLSA
THE T THEOEM V. CHOUSIONIS AND X. TOLSA Introduction These are the notes of a short course given by X. Tolsa at the Universitat Autònoma de Barcelona between November and December of 202. The notes have
More informationAPPROXIMATE IDENTITIES AND YOUNG TYPE INEQUALITIES IN VARIABLE LEBESGUE ORLICZ SPACES L p( ) (log L) q( )
Annales Academiæ Scientiarum Fennicæ Mathematica Volumen 35, 200, 405 420 APPROXIMATE IDENTITIES AND YOUNG TYPE INEQUALITIES IN VARIABLE LEBESGUE ORLICZ SPACES L p( ) (log L) q( ) Fumi-Yuki Maeda, Yoshihiro
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 informationRegularity 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 informationCommutators of Weighted Lipschitz Functions and Multilinear Singular Integrals with Non-Smooth Kernels
Appl. Math. J. Chinese Univ. 20, 26(3: 353-367 Commutators of Weighted Lipschitz Functions and Multilinear Singular Integrals with Non-Smooth Kernels LIAN Jia-li MA o-lin 2 WU Huo-xiong 3 Abstract. This
More informationON THE BEHAVIOR OF THE SOLUTION OF THE WAVE EQUATION. 1. Introduction. = u. x 2 j
ON THE BEHAVIO OF THE SOLUTION OF THE WAVE EQUATION HENDA GUNAWAN AND WONO SETYA BUDHI Abstract. We shall here study some properties of the Laplace operator through its imaginary powers, and apply the
More informationUniversität des Saarlandes. Fachrichtung 6.1 Mathematik
Universität des Saarlandes U N I V E R S I T A S S A R A V I E N I S S Fachrichtung 6.1 Mathematik Preprint Nr. 225 Estimates of the second-order derivatives for solutions to the two-phase parabolic problem
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 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 informationarxiv: v1 [math.ca] 13 Apr 2012
IINEAR DECOMPOSITIONS FOR THE PRODUCT SPACE H MO UONG DANG KY arxiv:204.304v [math.ca] 3 Apr 202 Abstract. In this paper, we improve a recent result by i and Peng on products of functions in H (Rd and
More informationMultilinear local Tb Theorem for Square functions
Multilinear local Tb Theorem for Square functions (joint work with J. Hart and L. Oliveira) September 19, 2013. Sevilla. Goal Tf(x) L p (R n ) C f L p (R n ) Goal Tf(x) L p (R n ) C f L p (R n ) Examples
More informationMAXIMAL AVERAGE ALONG VARIABLE LINES. 1. Introduction
MAXIMAL AVERAGE ALONG VARIABLE LINES JOONIL KIM Abstract. We prove the L p boundedness of the maximal operator associated with a family of lines l x = {(x, x 2) t(, a(x )) : t [0, )} when a is a positive
More informationTHE IMPLICIT FUNCTION THEOREM FOR CONTINUOUS FUNCTIONS. Carlos Biasi Carlos Gutierrez Edivaldo L. dos Santos. 1. Introduction
Topological Methods in Nonlinear Analysis Journal of the Juliusz Schauder Center Volume 32, 2008, 177 185 THE IMPLICIT FUNCTION THEOREM FOR CONTINUOUS FUNCTIONS Carlos Biasi Carlos Gutierrez Edivaldo L.
More informationM K -TYPE ESTIMATES FOR MULTILINEAR COMMUTATOR OF SINGULAR INTEGRAL OPERATOR WITH GENERAL KERNEL. Guo Sheng, Huang Chuangxia and Liu Lanzhe
Acta Universitatis Apulensis ISSN: 582-5329 No. 33/203 pp. 3-43 M K -TYPE ESTIMATES FOR MULTILINEAR OMMUTATOR OF SINGULAR INTEGRAL OPERATOR WITH GENERAL KERNEL Guo Sheng, Huang huangxia and Liu Lanzhe
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 informationHerz (cf. [H], and also [BS]) proved that the reverse inequality is also true, that is,
REARRANGEMENT OF HARDY-LITTLEWOOD MAXIMAL FUNCTIONS IN LORENTZ SPACES. Jesús Bastero*, Mario Milman and Francisco J. Ruiz** Abstract. For the classical Hardy-Littlewood maximal function M f, a well known
More informationFunction spaces with variable exponents
Function spaces with variable exponents Henning Kempka September 22nd 2014 September 22nd 2014 Henning Kempka 1 / 50 http://www.tu-chemnitz.de/ Outline 1. Introduction & Motivation First motivation Second
More informationLocal maximal operators on fractional Sobolev spaces
Local maximal operators on fractional Sobolev spaces Antti Vähäkangas joint with H. Luiro University of Helsinki April 3, 2014 1 / 19 Let G R n be an open set. For f L 1 loc (G), the local Hardy Littlewood
More informationLiouville-type theorems and decay estimates for solutions to higher order elliptic equations
Liouville-type theorems decay estimates for solutions to higher order elliptic equations Guozhen Lu, Peiyong Wang Jiuyi Zhu Abstract. Liouville-type theorems are powerful tools in partial differential
More informationHeat-diffusion maximal operators for Laguerre semigroups with negative parameters
Journal of Functional Analsis 9 5 3 36 www.elsevier.com/locate/jfa Heat-diffusion maximal operators for Laguerre semigroups with negative parameters R. Macías a,,c.segovia b,, J.L. Torrea c, a IMAL-FIQ,
More informationNotes. 1 Fourier transform and L p spaces. March 9, For a function in f L 1 (R n ) define the Fourier transform. ˆf(ξ) = f(x)e 2πi x,ξ dx.
Notes March 9, 27 1 Fourier transform and L p spaces For a function in f L 1 (R n ) define the Fourier transform ˆf(ξ) = f(x)e 2πi x,ξ dx. Properties R n 1. f g = ˆfĝ 2. δλ (f)(ξ) = ˆf(λξ), where δ λ f(x)
More informationA SHORT PROOF OF THE COIFMAN-MEYER MULTILINEAR THEOREM
A SHORT PROOF OF THE COIFMAN-MEYER MULTILINEAR THEOREM CAMIL MUSCALU, JILL PIPHER, TERENCE TAO, AND CHRISTOPH THIELE Abstract. We give a short proof of the well known Coifman-Meyer theorem on multilinear
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 informationFractional integral operators on generalized Morrey spaces of non-homogeneous type 1. I. Sihwaningrum and H. Gunawan
Fractional integral operators on generalized Morrey spaces of non-homogeneous type I. Sihwaningrum and H. Gunawan Abstract We prove here the boundedness of the fractional integral operator I α on generalized
More informationTHE TWO-PHASE MEMBRANE PROBLEM REGULARITY OF THE FREE BOUNDARIES IN HIGHER DIMENSIONS. 1. Introduction
THE TWO-PHASE MEMBRANE PROBLEM REGULARITY OF THE FREE BOUNDARIES IN HIGHER DIMENSIONS HENRIK SHAHGHOLIAN, NINA URALTSEVA, AND GEORG S. WEISS Abstract. For the two-phase membrane problem u = λ + χ {u>0}
More informationu( x) = g( y) ds y ( 1 ) U solves u = 0 in U; u = 0 on U. ( 3)
M ath 5 2 7 Fall 2 0 0 9 L ecture 4 ( S ep. 6, 2 0 0 9 ) Properties and Estimates of Laplace s and Poisson s Equations In our last lecture we derived the formulas for the solutions of Poisson s equation
More informationCompactness for the commutators of multilinear singular integral operators with non-smooth kernels
Appl. Math. J. Chinese Univ. 209, 34(: 55-75 Compactness for the commutators of multilinear singular integral operators with non-smooth kernels BU Rui CHEN Jie-cheng,2 Abstract. In this paper, the behavior
More informationInclusion Properties of Weighted Weak Orlicz Spaces
Inclusion Properties of Weighted Weak Orlicz Spaces Al Azhary Masta, Ifronika 2, Muhammad Taqiyuddin 3,2 Department of Mathematics, Institut Teknologi Bandung Jl. Ganesha no. 0, Bandung arxiv:70.04537v
More informationThe continuity method
The continuity method The method of continuity is used in conjunction with a priori estimates to prove the existence of suitably regular solutions to elliptic partial differential equations. One crucial
More informationA NONLINEAR DIFFERENTIAL EQUATION INVOLVING REFLECTION OF THE ARGUMENT
ARCHIVUM MATHEMATICUM (BRNO) Tomus 40 (2004), 63 68 A NONLINEAR DIFFERENTIAL EQUATION INVOLVING REFLECTION OF THE ARGUMENT T. F. MA, E. S. MIRANDA AND M. B. DE SOUZA CORTES Abstract. We study the nonlinear
More informationA REMARK ON MINIMAL NODAL SOLUTIONS OF AN ELLIPTIC PROBLEM IN A BALL. Olaf Torné. 1. Introduction
Topological Methods in Nonlinear Analysis Journal of the Juliusz Schauder Center Volume 24, 2004, 199 207 A REMARK ON MINIMAL NODAL SOLUTIONS OF AN ELLIPTIC PROBLEM IN A BALL Olaf Torné (Submitted by Michel
More informationSOLUTIONS TO HOMEWORK ASSIGNMENT 4
SOLUTIONS TO HOMEWOK ASSIGNMENT 4 Exercise. A criterion for the image under the Hilbert transform to belong to L Let φ S be given. Show that Hφ L if and only if φx dx = 0. Solution: Suppose first that
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 informationOn Estimates of Biharmonic Functions on Lipschitz and Convex Domains
The Journal of Geometric Analysis Volume 16, Number 4, 2006 On Estimates of Biharmonic Functions on Lipschitz and Convex Domains By Zhongwei Shen ABSTRACT. Using Maz ya type integral identities with power
More informationDETERMINATION OF THE BLOW-UP RATE FOR THE SEMILINEAR WAVE EQUATION
DETERMINATION OF THE LOW-UP RATE FOR THE SEMILINEAR WAVE EQUATION y FRANK MERLE and HATEM ZAAG Abstract. In this paper, we find the optimal blow-up rate for the semilinear wave equation with a power nonlinearity.
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 informationTRACES FOR FRACTIONAL SOBOLEV SPACES WITH VARIABLE EXPONENTS
Adv. Oper. Theory 2 (2017), no. 4, 435 446 http://doi.org/10.22034/aot.1704-1152 ISSN: 2538-225X (electronic) http://aot-math.org TRACES FOR FRACTIONAL SOBOLEV SPACES WITH VARIABLE EXPONENTS LEANDRO M.
More informationFree energy estimates for the two-dimensional Keller-Segel model
Free energy estimates for the two-dimensional Keller-Segel model dolbeaul@ceremade.dauphine.fr CEREMADE CNRS & Université Paris-Dauphine in collaboration with A. Blanchet (CERMICS, ENPC & Ceremade) & B.
More informationPotential Analysis meets Geometric Measure Theory
Potential Analysis meets Geometric Measure Theory T. Toro Abstract A central question in Potential Theory is the extend to which the geometry of a domain influences the boundary regularity of the solution
More informationError estimates for moving least square approximations
Applied Numerical Mathematics 37 (2001) 397 416 Error estimates for moving least square approximations María G. Armentano, Ricardo G. Durán 1 Departamento de Matemática, Facultad de Ciencias Exactas y
More informationNEW MAXIMAL FUNCTIONS AND MULTIPLE WEIGHTS FOR THE MULTILINEAR CALDERÓN-ZYGMUND THEORY
NEW MAXIMAL FUNCTIONS AND MULTIPLE WEIGHTS FOR THE MULTILINEAR CALDERÓN-ZYGMUND THEORY ANDREI K. LERNER, SHELDY OMBROSI, CARLOS PÉREZ, RODOLFO H. TORRES, AND RODRIGO TRUJILLO-GONZÁLEZ Abstract. A multi(sub)linear
More informationOn isomorphisms of Hardy spaces for certain Schrödinger operators
On isomorphisms of for certain Schrödinger operators joint works with Jacek Zienkiewicz Instytut Matematyczny, Uniwersytet Wrocławski, Poland Conference in Honor of Aline Bonami, Orleans, 10-13.06.2014.
More informationMathematical Research Letters 4, (1997) HARDY S INEQUALITIES FOR SOBOLEV FUNCTIONS. Juha Kinnunen and Olli Martio
Mathematical Research Letters 4, 489 500 1997) HARDY S INEQUALITIES FOR SOBOLEV FUNCTIONS Juha Kinnunen and Olli Martio Abstract. The fractional maximal function of the gradient gives a pointwise interpretation
More informationMULTIPLE SOLUTIONS FOR A KIRCHHOFF EQUATION WITH NONLINEARITY HAVING ARBITRARY GROWTH
MULTIPLE SOLUTIONS FOR A KIRCHHOFF EQUATION WITH NONLINEARITY HAVING ARBITRARY GROWTH MARCELO F. FURTADO AND HENRIQUE R. ZANATA Abstract. We prove the existence of infinitely many solutions for the Kirchhoff
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 informationRegularity for Poisson Equation
Regularity for Poisson Equation OcMountain Daylight Time. 4, 20 Intuitively, the solution u to the Poisson equation u= f () should have better regularity than the right hand side f. In particular one expects
More informationA n (T )f = 1 n 1. T i f. i=0
REVISTA DE LA UNIÓN MATEMÁTICA ARGENTINA Volumen 46, Número 1, 2005, Páginas 47 51 A NOTE ON THE L 1 -MEAN ERGODIC THEOREM Abstract. Let T be a positive contraction on L 1 of a σ-finite measure space.
More informationMULTIPLE SOLUTIONS FOR THE p-laplace EQUATION WITH NONLINEAR BOUNDARY CONDITIONS
Electronic Journal of Differential Equations, Vol. 2006(2006), No. 37, pp. 1 7. ISSN: 1072-6691. URL: http://ejde.math.txstate.edu or http://ejde.math.unt.edu ftp ejde.math.txstate.edu (login: ftp) MULTIPLE
More informationDivergence operator and Poincaré inequalities on arbitrary bounded domains
Divergence operator and Poincaré inequalities on arbitrary bounded domains Ricardo G. Durán a, Maria-Amelia Muschietti b, Emmanuel Russ c and Philippe Tchamitchian c a Universidad de Buenos Aires Facultad
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 informationWEIGHTED NORM INEQUALITIES, OFF-DIAGONAL ESTIMATES AND ELLIPTIC OPERATORS PASCAL AUSCHER AND JOSÉ MARÍA MARTELL
Proceedings of the 8th International Conference on Harmonic Analysis and Partial Differential Equations, El Escorial, June 16-2, 28 Contemporary Mathematics 55 21), 61--83 WEIGHTED NORM INEQUALITIES, OFF-DIAGONAL
More informationA NOTE ON THE CONMUTATOR OF THE HILBERT TRANSFORM CARLOS SEGOVIA - JOSE L. TORREA. Introduction
Revista de la Union Matematica Argentina Vol. 35.1990 A NOTE ON THE CONMUTATOR OF THE HILBERT TRANSFORM CARLOS SEGOVIA - JOSE L. TORREA Introduction The purpose of this paper is to give a different proof
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 information