Results 51 to 60 of about 579,350 (178)
Operator Monotone Functions and Convexity of Its Derivatives Norms
پژوهشهای ریاضی, 2021 Introduction Given the important role convex and quasi-convex functions play in many areas of mathematics and especially in optimization, one of the inequalities that has attracted the attention of many mathematicians in recent decades is Hermit ...
Zahra Rahimi Chegeni +2 more
doaj
Systems Thinking for T‐Shaped Sustainability Education: A Viable Systems Approach (vSa)
Systems Research and Behavioral Science, Volume 43, Issue 5, Page 2107-2123, September/October 2026.ABSTRACT Sustainability represents a complex and evolving paradigm calling for competences necessary for a deep understanding of the interdependencies among human, environmental, economic, and cultural dimensions. Along with a review of the literature and an analysis of official guidelines from leading international institutions, this study assesses ...
Marialuisa Saviano +4 more
wiley +1 more source
Geometry of essential matrix ranges and the Smith–Ward problem for operator systems
Bulletin of the London Mathematical Society, Volume 58, Issue 9, September 2026.Abstract A d$d$‐tuple of bounded linear selfadjoint operators acting on an infinite‐dimensional separable Hilbert space is said to have the Smith–Ward property if the identity map of the image of the operator system in the Calkin algebra has a completely positive lift.
Douglas Farenick +2 more
wiley +1 more source
On some inequalities for unitarily invariant norms and singular values [PDF]
, 2012 In this note, we improve and generalize some existing inequalities for unitarily invariant norms and singular values, and present some other inequalities for unitarily invariant ...
Zou, Limin, He, Chuanjiang
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Generalizations of unitarily invariant norm inequalities for matrices [PDF]
In this article, we begin by deriving a unitarily invariant norm inequality for matrices, which is a generalization of the result due to Cao and Wu. Additionally, we introduce a matrix Cauchy-Schwarz inequality for unitarily invariant norms, further ...
Xue, Jianming, Hu, Xingkai, Yi, Yuan
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A proof of Esterle's conjecture on negative powers of Hilbert‐space contractions
Bulletin of the London Mathematical Society, Volume 58, Issue 9, September 2026.Abstract We establish the following result, confirming a conjecture of Jean Esterle. For each closed subset E$E$ of the unit circle of Lebesgue measure zero, there exists a positive sequence un→∞$u_n\rightarrow \infty$ with the following property: If T$T$ is a contraction on a Hilbert space such that σ(T)⊂E$\sigma (T)\subset E$ and ∥T−n∥=O(un)$\Vert T^{
Thomas Ransford
wiley +1 more source
Zhejiang Daxue xuebao. Lixue ban, 2018 MENG等给出了 {1，3}-和{1，4}-逆在谱范数和Frobenius范数下的加法和乘法扰动界，本文研究了 {1，3}-和{1,4}-逆在一般的酉不变范数下的加法和乘法扰动界，所得结果推广和改进了已有文献中的相关结果.
MENGLingsheng(孟令胜)
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Unitarily invariant norms related to factors
, 2007 42 pages, the introduction is rewritten, minor ...
Fang, Junsheng, Hadwin, Don
openaire +2 more sources
Detecting When One Probe Vector is Enough for Preconditioned Log‐Determinant Approximation
Numerical Linear Algebra with Applications, Volume 33, Issue 4, August 2026.ABSTRACT We present randomized algorithms for estimating the log‐determinant of regularized symmetric positive semi‐definite matrices. The algorithms access the matrix only through matrix vector products, and are based on the introduction of a preconditioner and stochastic trace estimator.
Alice Cortinovis, Daniele Toni
wiley +1 more source
Unitarily invariant valuations on convex functions, I
, 2021 We study continuous, dually epi-translation invariant valuations on ℂⁿ that are invariant under the unitary group and we give a description of all valuations belonging to the dense subspace of smooth valuations.
Knörr, Jonas
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