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Keywords:
Banach space; closed linear operators; Drazin inverse; spectral sets; second order differential equations
Banach space; closed linear operators; Drazin inverse; spectral sets; second order differential equations
Summary:
The paper defines and studies the Drazin inverse for a closed linear operator $A$ in a Banach space $X$ in the case that $0$ belongs to a spectral set of the spectrum of $A$. Results are applied to extend a result of Krein on a nonhomogeneous second order differential equation in a Banach space.
References:
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