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Samuel multiplicities and Browder Spectrum of Operator Matrices
Samuel multiplicities Operator matrices Upper semi-Browder operator Upper semi-Browder spectrum
2011/8/23
Abstract: we show that the definitions of some classes of semi-Fredholm operators, which use the language of algebra and first introduced by X. Fang in [8], are equivalent to that of some well-known o...
Conditions of fixed sign for $n\times n$ operator matrices
Operator matrix Hilbert space positive definiteness criterion
2010/11/26
A positive definiteness criterion and, under the additional conditions, a non-negativity criterion for a self-adjoint continuous operator matrix, acting in product of an arbitrary number of real separ...