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On the Gevrey ultradifferentiability of weak solutions of an abstract evolution equation with a scalar type spectral operator of orders less than one. (English) Zbl 1506.34076

Summary: It is shown that, if all weak solutions of the evolution equation \[y'(t)=Ay(t),\, t\ge 0,\] with a scalar type spectral operator \(A\) in a complex Banach space are Gevrey ultradifferentiable of orders less than one, then the operator \(A\) is necessarily bounded.

MSC:

34G10 Linear differential equations in abstract spaces
47B40 Spectral operators, decomposable operators, well-bounded operators, etc.
30D15 Special classes of entire functions of one complex variable and growth estimates
47B15 Hermitian and normal operators (spectral measures, functional calculus, etc.)
47D06 One-parameter semigroups and linear evolution equations
47D60 \(C\)-semigroups, regularized semigroups

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