Jean-Christophe Bourin

activity

20022026

most citedUnitary orbits of Hermitian operators with convex or concave functions

79 citations · 132 across the 27 of their papers we have counts for

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Showing 2002Show all

2 papers · 1 filter

math.FA2002

Total Dilations

Jean-Christophe Bourin

(1) Let $A$ be an operator on a space $H$ of even finite dimension. Then for some decomposition $H = F \oplus F^{⊥}$ , the compressions of $A$ onto ${\ca…

math.FA2002★ 21 cited

Compressions and Pinchings

Jean-Christophe Bourin

There exist operators $A$ such that : for any sequence of contractions ${A_{n}}$ , there is a total sequence of mutually orthogonal projections ${E_{n}}$ such that $ΣE_nAE_n=\bigopl…