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We are concerned with the problem of finding sharp summability conditions on the weights which render certain weighted inequalities of Poincaré - type true. The conditions we find consist of proper integral balances between the growths of the rearrangements of the weights. 相似文献
23.
D.E. Edmunds R. Hurri-Syrjnen 《Journal of Mathematical Analysis and Applications》2005,310(2):424-435
For bounded Lipschitz domains D in it is known that if 1<p<∞, then for all β[0,β0), where β0=p−1>0, there is a constant c<∞ with for all . We show that if D is merely assumed to be a bounded domain in that satisfies a Whitney cube-counting condition with exponent λ and has plump complement, then the same inequality holds with β0 now taken to be . Further, we extend the known results (see [H. Brezis, M. Marcus, Hardy's inequalities revisited, Dedicated to Ennio De Giorgi, Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4) 25 (1997–1998) 217–237; M. Hoffmann-Ostenhof, T. Hoffmann-Ostenhof, A. Laptev, A geometrical version of Hardy's inequality, J. Funct. Anal. 189 (2002) 537–548; J. Tidblom, A geometrical version of Hardy's inequality for W1,p(Ω), Proc. Amer. Math. Soc. 132 (2004) 2265–2271]) concerning the improved Hardy inequality c=c(n,p), by showing that the class of domains for which the inequality holds is larger than that of all bounded convex domains. 相似文献
24.
H. Dyer David E. Edmunds 《Zeitschrift für Angewandte Mathematik und Physik (ZAMP)》1961,12(6):497-507
Résumé On discute l'influence d'un champ magnétique circulaire sur la stabilité d'un fluide visqueux et conducteur de l'électricité en mouvement entre deux cylindres circulaires coaxiaux. Supposant que l'espacement entre les cylindres est petit par rapport à leurs rayons, on donne des résultats sur deux sortes de mouvement du fluide basique, produites par la rotation des cylindres et par un gradient de pression autour des cylindres. On démontre que le champ magnétique peut avancer ou retarder l'accrochage de l'instabilité, suivant les circonstances. 相似文献
25.
David E. Edmunds Petr Gurka Bohumí r Opic 《Proceedings of the American Mathematical Society》1998,126(8):2417-2425
Let be a subset of with finite volume, let and let be a Young function with for large . We show that the norm on the Orlicz space is equivalent to
We also obtain estimates of the norms of the embeddings of certain logarithmic Bessel potential spaces in which are sharp in their dependences on provided that is large enough.
26.
Irina Iovel Lena Golomba Juris Popelis Alexander Gaukhman Edmunds Lukevics 《应用有机金属化学》2001,15(1):67-74
The conjugate addition of some (hetero)aromatic amides to an α,β‐unsaturated ester (ethyl acrylate) proceeds efficiently in the presence of an equimolar amount of the CsF–Si(OEt)4 system to afford the corresponding ethyl esters of N‐substituted β‐amino acids. Copyright © 2001 John Wiley & Sons, Ltd. 相似文献
27.
We give sufficient conditions for domains to satisfy Sobolev inequalities of single exponential type. Earlier work in this
area imposed more stringent conditions on the domains and is thus contained in our results. Moreover, the class of functions
considered is based onL
n
log
an
L witha<1−1/n, n being the dimension of the underlying space. The limiting casea=1−1/n gives rise to an inequality of double exponential type which is shown to be valid in a large class of irregular domains.
This inequality is new even in smooth domains.
The second author was partially supported by a grant from Magnus Ehrnrooth Foundation. 相似文献
28.
29.
Let X and Y be reflexive Banach spaces with strictly convexduals, and let T be a compact linear map from X to Y. It isshown that a certain nonlinear equation, involving T and itsadjoint, has a normalised solution (an eigenvector)corresponding to an eigenvalue, and that the sameis true for each member of a countable family of similar equationsinvolving the restrictions of T to certain subspaces of X. Theaction of T can be described in terms of these eigenvectors.There are applications to the p-Laplacian, the p-biharmonicoperator and integral operators of Hardy type. 相似文献
30.
The equation 1 $$ - \Delta u + qu + f(x,u) = \lambda u, u \in W^{1,2} (\mathbb{R}^N )$$ is considered, whereq is bounded below andq(x)→∞ as |x|→∞. Under appropriate conditions on the perturbation termf(x, u) it is shown that given anyr>0, (*) has an infinite sequence (λ n, r ) n ∈ N of eigenvalues, eachλ n, r being associated with an eigenfunctionu n,r which satisfies \(\smallint _{R^N } \left| {u_{n,r} } \right|^2 = r^2 \) . Information about the behaviour ofλ n, r for largen is provided. The proofs rely on the compactness of the embedding of a certain weighted Sobolov space in anL p space; this is proved in §2. 相似文献