Existence of some semilinear nonlocal functional differential equations of neutral type (Q2015675)

Summary: This paper is concerned with the existence of mild and strong solutions on the interval \([0,T]\) for some neutral partial differential equations with nonlocal conditions. The linear part of the equations is assumed to generate a compact analytic semigroup of bounded linear operators, whereas the nonlinear part satisfies the Carathéodory condition and is bounded by some suitable functions. We first employ the Schauder fixed-point theorem to prove the existence of solution on the interval \([\delta, T]\) for \(\delta > 0\) that is small enough, and, then, by letting \(\delta\to 0\) and using a diagonal argument, we have the existence results on the interval \([0,T]\). This approach allows one to drop the compactness assumption on a nonlocal condition, which generalizes recent conclusions on this topic. The obtained results will be applied to a class of functional partial differential equations with nonlocal conditions.