Results 1 to 10 of about 206 (128)
Evaluating the influential factors for life preserver donning tests. [PDF]
PLoS ONE, 2021 Life preservers often play a vital role in ensuring passenger safety in water-related accidents, while the difficulty of donning life preservers has been repeatedly proved even in a donning test.
Ruiliang Yang, Zijiang Wu, Xiaoming Qian
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Linear maps preserving $A$-unitary operators [PDF]
Mathematica Bohemica, 2016 Let $\mathcal{H}$ be a complex Hilbert space, $A$ a positive operator with closed range in $\mathscr{B}(\mathcal{H})$ and $\mathscr{B}_A(\mathcal{H})$ the sub-algebra of $\mathscr{B}(\mathcal{H})$ of all $A$-self-adjoint operators. Assume $\phi \mathscr{
Abdellatif Chahbi +2 more
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On Some Linear Operators Preserving Disjoint Support Property [PDF]
Sahand Communications in Mathematical Analysis, 2021 The aim of this work is to characterize all bounded linear operators $T:\lpi\rightarrow\lpi$ which preserve disjoint support property. We show that the constant coefficients of all isometries on $\lpi$ are in the class of such operators, where $2\neq p ...
Noha Eftekhari, Ali Bayati Eshkaftaki
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Privacy-preserving Linear Programming [PDF]
Proceedings of the 2009 ACM symposium on Applied Computing, 2018 A Book ...
Hong, Yuan +3 more
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Rank 2 preservers on symmetric matrices with zero trace [PDF]
ITM Web of Conferences, 2021 Let F be a field, V1 and V2 be vector spaces of matrices over F and let ρ be the rank function. If T :V1 → V2 is a linear map, and k a fixed positive integer, we say that T is a rank k preserver if for any matrix Aϵ, V1 ρ(A) = k implies ρ(T( A))= k .
Kok Wai Keong
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Linear Maps Preserving Invertibility or Spectral Radius on Some $C^{*}$-algebras [PDF]
Sahand Communications in Mathematical Analysis, 2018 Let $A$ be a unital $C^{*}$-algebra which has a faithful state. If $varphi:Arightarrow A$ is a unital linear map which is bijective and invertibility preserving or surjective and spectral radius preserving, then $varphi$ is a Jordan isomorphism. Also, we
Fatemeh Golfarshchi +1 more
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The Linear Coordinate Preserving Problem [PDF]
Communications in Algebra, 2008 We prove that every K-endomorphism of a rank 2 polynomial algebra over an algebraically closed field K of positive characteristic taking all linear coordinates to coordinates is an automorphism. We give a new characterization of coordinates of K[t][x, y], where K is an algebraically closed field of any characteristic.
Gong, SJ, Yu, JT
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SGLT-MAJORIZATION ON Mn,m AND ITS LINEAR PRESERVERS [PDF]
Journal of Mahani Mathematical Research, 2018 A matrix R is said to be g-row substochastic if Re ≤ e. For X, Y ∈ Mn,m, it is said that X is sglt-majorized by Y , X ≺sglt Y , if there exists an n-by-n lower triangular g-row substochastic matrix R such that X = RY .
Asma Ilkhanizadeh Manesh
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Monotonicity-Preserving Linear Multistep Methods [PDF]
SIAM Journal on Numerical Analysis, 2003 The authors consider several linear multistep methods for ordinary differential equations and provide an analysis of their monotonicity properties, which mainly include positivity and the diminishing of total variation. It is shown that suitable starting procedures allow for statements on monotonicity for important classes of methods not covered by ...
Willem Hundsdorfer +2 more
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A note on preserving the spark of a matrix
Annales Universitatis Paedagogicae Cracoviensis: Studia Mathematica, 2015 Let Mm× n(F) be the vector space of all m× n matrices over a field F. In the case where m ≥ n, char (F) ≠ 2 and F has at least five elements, we give a complete characterization of linear maps Φ : Mm× n(F) → Mm× n(F) such that spark(Φ (A)) = spark(A) for
Marcin Skrzynski
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