期刊
JOURNAL OF DIFFERENTIAL EQUATIONS
卷 247, 期 8, 页码 2235-2269出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jde.2009.06.025
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类别
资金
- UMK [382-M]
- TODEQ [MTKD-CT-2005-030042]
In the first part of the paper we provide a construction of an abstract homotopy invariant detecting zeros of maps of the form -A + F where A: D(A) -o E is a densely defined m-accretive operator in a Banach space E and F : U -> E is a tangent field defined on an open subset U of a neighborhood retract M being invariant with respect to the resolvents of A. The construction is performed under the assumption that resolvents of A are completely continuous. In the second part we derive index formulae for isolated zeros and apply them to show the existence of nontrivial positive steady state solutions for a class of nonlinear reaction-diffusion equations and equations with one-dimensional p-Laplacian with possibly non-positive perturbations as well as some controlled Neumann-like problems. (C) 2009 Elsevier Inc. All rights reserved.
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