info:eu-repo/semantics/article
Spectral enclosures for a class of block operator matrices
Fecha
2020-01Registro en:
Giribet, Juan Ignacio; Langer, Matthias; Martinez Peria, Francisco Dardo; Philipp, Friedrich; Trunk, Carsten Joachim; Spectral enclosures for a class of block operator matrices; Academic Press Inc Elsevier Science; Journal of Functional Analysis; 278; 10; 1-2020; 1-30; 108455
0022-1236
CONICET Digital
CONICET
Autor
Giribet, Juan Ignacio
Langer, Matthias
Martinez Peria, Francisco Dardo
Philipp, Friedrich
Trunk, Carsten Joachim
Resumen
We prove new spectral enclosures for the non-real spectrum of a class of 2 X 2 block operator matrices with self-adjoint operators A and D on the diagonal and operators B and -B^* as off-diagonal entries. One of our main results resembles Gershgorin´s circle theorem. The enclosures are applied to J-frame operators.