Mathematics – Functional Analysis
Scientific paper
2011-08-06
Mathematics
Functional Analysis
6 pages, to appear in Linear Algebra Appl
Scientific paper
We establish some operator versions of Bellman's inequality. In particular, we prove that if $\Phi: \mathbb{B}(\mathscr{H}) \to \mathbb{B}(\mathscr{K})$ is a unital positive linear map, $A,B \in \mathbb{B}(\mathscr{H})$ are contractions, $p>1$ and $0 \leq \lambda \leq 1$, then {eqnarray*} \big(\Phi(I_\mathscr{H}-A\nabla_{\lambda}B)\big)^{1/p}\ge\Phi\big((I_\mathscr{H}-A)^{1/p}\nabla_{\lambda}(I_\mathscr{H}-B)^{1/p}\big). {eqnarray*}
Mirzapour F.
Morassaei A.
Moslehian Mohammad Sal
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