Results 121 to 130 of about 1,164 (138)

From discrete flow of Beckner to continuous flow of Janson in complex hypercontractivity [PDF]

open access: yesarXiv, 2017
We show how Beckner's montonicity result on Hamming cube easily implies the monotonicity of a flow introduced by Janson in Hausdorff--Young ...
arxiv  

Continuity and Discontinuity of Seminorms on Infinite-Dimensional Vector Spaces [PDF]

open access: yesarXiv, 2019
Let $S$ be a seminorm on an infinite-dimensional real or complex vector space $X$. Our purpose in this note is to study the continuity and discontinuity properties of $S$ with respect to certain norm-topologies on $X$.
arxiv  

Some inequalities for $(\alpha, \beta)$-normal operators in Hilbert spaces

open access: yes, 2008
An operator $T$ acting on a Hilbert space is called $(\alpha ,\beta)$-normal ($0\leq \alpha \leq 1\leq \beta $) if \begin{equation*} \alpha ^{2}T^{\ast }T\leq TT^{\ast}\leq \beta ^{2}T^{\ast}T.
Dragomir, Sever S.   +1 more
core  

Improved Heinz inequalities via the Jensen functional

open access: yesOpen Mathematics, 2013
Krnić Mario, Pečarić Josip
doaj   +1 more source

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