Abstract
We consider a system of two semilinear parabolic inclusions depending on a small parameter ε>0 which is present both in front of the derivative in one of the two inclusions and in the nonlinear terms to model high-frequency inputs. The aim is to provide conditions in order to guarantee, for ε>0 sufficiently small, the existence of periodic solutions and in order to study their behaviour as ε tends to zero. Our assumptions permit the definition of upper semicontinuous, convex valued, compact vector operators whose fixed points represent the sought-after periodic solutions. The existence of fixed points is shown by using topological degree theory arguments.
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