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On analytical in a sector resolving families of operators for strongly degenerate evolution equations of higher and fractional orders. (English. Russian original) Zbl 1417.34010

J. Math. Sci., New York 236, No. 6, 663-678 (2019); translation from Itogi Nauki Tekh., Ser. Sovrem. Mat. Prilozh., Temat. Obz. 137, 82-96 (2017).
Summary: In this paper, we study a class of linear evolution equations of fractional order that are degenerate on the kernel of the operator under the sign of the derivative and on its relatively generalized eigenvectors. We prove that in the case considered, in contrast to the case of first-order degenerate equations and equations of fractional order with weak degeneration (i.e., degeneration only on the kernel of the operator under the sign of the derivative), the family of analytical in a sector operators does not vanish on relative generalized eigenspaces of the operator under the sign of the derivative, has a singularity at zero, and hence does not determine any solution of a strongly degenerate equation of fractional order. For the case of a strongly degenerate equation of integer order this fact does not hold, but the behavior of the family of resolving operators at zero cannot be examined by ordinary method.

MSC:

34A08 Fractional ordinary differential equations
34G10 Linear differential equations in abstract spaces
35R11 Fractional partial differential equations
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