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math.SP2009
On spectrum and approximations of one class of sign-symmetric matrices
Olga Y. Kushel
A new class of sign-symmetric matrices is introduced in this paper. Such matrices are named J--sign-symmetric. The spectrum of a J--sign-symmetric irreducible matrix is studied und…
math.SP2008
Gantmakher-Krein theorem for 2-totally nonnegative operators in ideal spaces
Olga Y. Kushel, Petr P. Zabreiko
The tensor and exterior squares of a completely continuous non-negative linear operator acting in the ideal space are studied. The theorem representing the point spectru…