J. Tomiyama

activity

20022017

most citedDifferential analysis of matrix convex functions

35 citations · 120 across the 15 of their papers we have counts for

collaborators

Showing 2008 · math.OAShow all

2 papers · 2 filters

math.OA2008★ 3 cited

On the commutant of $C (X)$ in $C^{*}$ -crossed products by $Z$ and their representations

Christian Svensson, Jun Tomiyama

For the $C^{*}$ -crossed product $C^{*} (Σ)$ associated with an arbitrary topological dynamical system $Σ = (X, σ)$ , we provide a detailed analysis of the commutant, in $C^{*} (Σ)$ , of $C(X…

math.OA2008

Structure of the spaces of matrix monotone functions and of matrix convex functions and Jensen's type inequality for operators

Hiroyuki Osaka, Jun Tomiyama

Let $n \in N$ and $M_{n}$ be the algebra of $n \times n$ matrices. We call a function $f$ matrix monotone of order $n$ or $n$ -monotone in short whenever the inequality $f(a) \leq f(…

On the commutant of C(X) in C∗-crossed products by Z and their representations

Structure of the spaces of matrix monotone functions and of matrix convex functions and Jensen's type inequality for operators

On the commutant of $C (X)$ in $C^{*}$ -crossed products by $Z$ and their representations