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Revista de la Unión Matemática Argentina
versión impresa ISSN 0041-6932versión On-line ISSN 1669-9637
Resumen
CANO, Cristina; MOSCONI, Irene y STOJANOFF, Demetrio. Some operator inequalities for unitarily invariant norms. Rev. Unión Mat. Argent. [online]. 2005, vol.46, n.1, pp.53-66. ISSN 0041-6932.
Let be the algebra of bounded operators on a complex separable Hilbert space
. Let
be a unitarily invariant norm defined on a norm ideal
. Given two positive invertible operators
and
, we show that
,
. This extends Zhangs inequality for matrices. We prove that this inequality is equivalent to two particular cases of itself, namely
and
. We also characterize those numbers
such that the map
given by
is invertible, and we estimate the induced norm of
acting on the norm ideal
. We compute sharp constants for the involved inequalities in several particular cases.
Palabras clave : Positive matrices; Inequalities; Unitarily invariant norm.
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