نتایج جستجو برای: positive operator

تعداد نتایج: 745832  

Journal: :Transactions of the American Mathematical Society 2019

Journal: :Rocky Mountain Journal of Mathematics 2021

In the signal-processing literature, a frame is mechanism for performing analysis and reconstruction in Hilbert space. By contrast, quantum theory, positive operator-valued measure (POVM) decomposes Hilbert-space vector purpose of computing measurement probabilities. Frames their most common generalizations can be seen to give rise POVMs, but does every reasonable POVM arise from type frame? We...

A $it{weighted~slant~Toep}$-$it{Hank}$ operator $L_{phi}^{beta}$ with symbol $phiin L^{infty}(beta)$ is an operator on $L^2(beta)$ whose representing matrix consists of all even (odd) columns from a weighted slant Hankel (slant weighted Toeplitz) matrix, $beta={beta_n}_{nin mathbb{Z}}$ be a sequence of positive numbers with $beta_0=1$. A matrix characterization for an operator to be $it{weighte...

Journal: :Proceedings of the American Mathematical Society 1980

Journal: :Journal of the London Mathematical Society 2005

Journal: :Indagationes Mathematicae (Proceedings) 1983

Journal: :Journal of Differential Geometry 1986

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