Admissible Lp norms for local existence and for continuation in semilinear parabolic systems are not the same

Author: Quittner Pavol   Souplet Philippe  

Publisher: Royal Society of Edinburgh

ISSN: 1473-7124

Source: Proceedings Section A: Mathematics - Royal Society of Edinburgh, Vol.131, Iss.6, 2001-12, pp. : 1435-1456

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Abstract

We say that a Banach space E is a continuation space for a given parabolic problem if the E-norm of any non-global solution has to become unbounded. We will prove that for large classes of parabolic systems of two equations, the space E = Lr1 × Lr2 can be a continuation space even though the problem is not locally well posed in E. This stands in contrast with classical results for analogous scalar equations.