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math.FA2019
Harnack parts for some truncated shifts
Gilles Cassier, Mohammed Benharrat
The purpose of this paper is to analysis the Harnack part of some truncated shifts whose -numerical radius equal one in the finite dimensional case. As pointed out in Theorem 1.…
math.FA2005★ 34 cited
Constrained von Neumann inequalities
Catalin Badea, Gilles Cassier
An equivalent formulation of the von Neumann inequality states that the backward shift on is extremal, in the sense that if is a Hilbert space contraction, the…