In this paper we get an algebraic derivative relative to the convolution associated to the operator , which is used, together with the corresponding operational calculus, to solve an integral-differential equation. Moreover we show a certain convolution property for the solution of that equation
Let be an operator acting on a Banach space , let and be respectively the spectrum and the B-Weyl spectrum of . We say that satisfies the generalized Weyl’s theorem if , where is the set of all isolated eigenvalues of . The first goal of this paper is to show that if is an operator of topological uniform descent and is an accumulation point of the point spectrum of then does not have the single valued extension property at , extending an earlier result of J. K. Finch and a...
The paper gives new integral representations of the -Drazin inverse of an element of a -algebra that require no restriction on the spectrum of . The representations involve powers of and of its adjoint.
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