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Solvability of the Cauchy problem for infinite delay equations. (English) Zbl 1058.34106

By using topological methods, expressed in terms of the Kuratowski measure of noncompactness, the authors prove several existence results on mild solutions for the infinite delay functional-integral equation

u(t)=g(t)+ σ t f(t,s,u(s),u s )ds,σtT,u σ =φ,

and semilinear functional-differential equations of the form

u ' (t)=Au(t)+f(t,u(t),u t ),0tT,u 0 =φ,

with φ. Here, is an admissible function space, i.e., a suitable chosen subspace of functions from (-,σ] to X, with X a Banach space, φ, x t (s)=x(t+s), f is either in C([σ,T]×[σ,T]×X×;X) or in C([σ,T]×X×;X) and A:D(A)XX is a linear operator. An extension to the case when A may depend on t as well is considered, and an application to a functional integro-differential equation of Schrödinger type is included.

MSC:
34K30Functional-differential equations in abstract spaces
47D62Integrated semigroups
35Q55NLS-like (nonlinear Schrödinger) equations
35K05Heat equation