On the Solvability of Some Abstract Differential Equations

Details On the Solvability of Some Abstract Differential Equations On the Solvability of Some Abstract Differential Equations

2003-06-21

arxiv.org/abs/math/0306312v1

Mathematics

Analysis of PDEs

10 pages

Scientific paper

This paper is concerned with the solvability of some abstract differential equation of type $$\dot u(t) + Au(t) + Bu(t) \ni f(t), t \in (0,T], u(0) = 0,$$ where $A$ is a linear selfadjoint operator and $B$ is a nonlinear(possibly multi-valued)maximal monotone operator in a (real) Hilbert space ${\mathbb H}$ with the normalization $0 \in B (0)$. We use the concept of variational sum introduced by H. Attouch, J.-B. Baillon, and M. Th\'era, to investigate solutions to the given abstract differential equation. Several applications will be discussed, among them the case where $B = \subdifferential \phi$, the subdifferential of a convex semicontinuous proper function $\phi$.

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