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Abstract
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The nonlinear semigroup generated by the subdifferential of a convex lower semicontinuous
function
has a smoothing effect, discovered by Haïm Brezis, which implies maximal
regularity for the evolution equation. We use this and Schaefer’s fixed
point theorem to solve the evolution equation perturbed by a Nemytskii
operator of sublinear growth. For this, we need that the sublevel sets of
are not only closed, but even compact. We apply our results to the
-Laplacian
and also to the Dirichlet-to-Neumann operator with respect to
-harmonic
functions.
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Keywords
nonlinear semigroups, subdifferential, Schaefer's fixed
point theorem, existence, smoothing effect, perturbation,
compact sublevel sets
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Mathematical Subject Classification 2010
Primary: 35K92, 35K58, 47H20, 47H10
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Milestones
Received: 14 February 2019
Revised: 3 August 2019
Accepted: 9 September 2019
Published: 9 November 2019
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