Abstract
Abstract We prove a modification of the so-called A ( t ) A(t) -caloric lemma stated in our earlier work with O. John [1] to study regularity of weak solutions to parabolic systems of non-divergence type with non-smooth in time principal matrices. As an application, we prove smoothness results in Morrey and Campanato spaces for linear parabolic systems of non-divergence type by the A ( t ) A(t) -caloric approximation method.
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