摘要

In this paper, we study the existence of anti-periodic solutions for the first order evolution equation [GRAPHICS] a Hilbert space H, where G : H -> R is an even function such that partial derivative G is a mapping of class (S ) and f : R -> R satisfies f (t T) = -f (t) for any t is an element of R with f ((.)) is an element of L-2(0, T; H).