Let O denote a nonempty finite set. Let SðOÞ denote the symmetric group on O and let PðOÞ denote the power set of O: Let r : SðOÞ ! UðL 2 ðPðOÞÞÞ be the left unitary representation of SðOÞ associated with its natural action on PðOÞ: We consider the algebra consisting of those endomorphisms of L 2 ðP
W2, p estimates of the heat equation in Ω⊂ℝn and the restrictions on ∂Ω
✍ Scribed by Gavin Waters; Lihe Wang
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 249 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0170-4214
- DOI
- 10.1002/mma.668
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✦ Synopsis
Abstract
This is an alternative approach of finding the W^2, p^ estimates of the heat equation in a domain, Ω⊂ℝ^n^. Methods used in (Acta Math. Sin. 2003; 19(2):381–396) are expanded to the case of a bounded domain. As a result, milder restrictions are applied to ∂Ω than previously required by using the classical singular integral approach. Copyright © 2005 John Wiley & Sons, Ltd.
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## Abstract We estimate the blow‐up time for the reaction diffusion equation __u__~__t__~=Δ__u__+ λ__f__(__u__), for the radial symmetric case, where __f__ is a positive, increasing and convex function growing fast enough at infinity. Here λ>λ^\*^, where λ^\*^ is the ‘extremal’ (critical) value for