Results 241 to 250 of about 15,991 (314)
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Preserving the food preservation legacy
Critical Reviews in Food Science and Nutrition, 2022This paper deals with the question about how early humans managed to feed themselves, and how they preserved and stored food for times of need. It attempts to show how humans interacted with their environments and demonstrate what lessons can be learnt from the about 3.4 million years of food processing and preservation.
Dietrich, Knorr, Mary Ann, Augustin
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Matrix Analysis and Entrywise Positivity Preservers
, 2022Matrices and kernels with positivity structures, and the question of entrywise functions preserving them, have been studied throughout the 20th century, attracting recent interest in connection to high-dimensional covariance estimation. This is the first
A. Khare
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Singular linear preservers of majorization and cone type majorization
Linear and multilinear algebra, 2022Since the introduction of majorization in by Hardy, Littlewood and Polya, several extensions of this concept have been studied in the literature. Recently, Kosuru and Saha [Cone type majorization and its strong linear preservers.
María Isabel Bueno Cachadina +3 more
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Preservers of unitary group or equivalence by unitaries
Linear Algebra and its Applications, 2022We give the complete description of bijective real-linear transformations on B ( H ) , the algebra of all bounded linear operators on an infinite-dimensional complex Hilbert space H , where every unitary U ∈ B ( H ) is mapped to a unitary ϕ ( U ) .
T. Petek, Gordana Radic
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Commutativity Preservers of Incidence Algebras
Algebras and Representation Theory, 2022Let I(X, K) be the incidence algebra of a finite connected poset X over a field K and D(X, K) its subalgebra consisting of diagonal elements. We describe the bijective linear maps φ:I(X,K)→I(X,K)\documentclass[12pt]{minimal} \usepackage{amsmath ...
Érica Z. Fornaroli +2 more
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Pairwise Reachability Oracles and Preservers under Failures
International Colloquium on Automata, Languages and Programming, 2021In this paper, we consider reachability oracles and reachability preservers for directed graphs/networks prone to edge/node failures. Let $G = (V, E)$ be a directed graph on $n$-nodes, and $P\subseteq V\times V$ be a set of vertex pairs in $G$.
Diptarka Chakraborty +2 more
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Non-linear modular Birkhoff-James orthogonality preservers between spaces of continuous functions
, 2021A new notion of non-linear isomorphisms between Banach modules is introduced based on modular Birkhoff-James orthogonality. It is shown that a (possibly non-linear) bijective modular Birkhoff-James orthogonality preserver in both direction between spaces
Ryotaro Tanaka
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On preservers related to the spectral geometric mean
, 2021In this paper we study preserver transformations between positive definite cones in operator algebras relating the spectral geometric mean of Fiedler and Ptak.
Lei Li, L. Molnár, Liguang Wang
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Positivity preservers over finite fields
Journal of AlgebraWe resolve an algebraic version of Schoenberg's celebrated theorem [Duke Math.J., 1942] characterizing entrywise matrix transforms that preserve positive definiteness. Compared to the classical real and complex settings, we consider matrices with entries
D. Guillot +3 more
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\({K}\)-Positivity Preservers and Their Generators
SIAM Journal on applied algebra and geometryWe study $K$-positivity preservers with given closed $K\subseteq\mathbb{R}^n$, i.e., linear maps $T:\mathbb{R}[x_1,\dots,x_n]\to\mathbb{R}[x_1,\dots,x_n]$ such that $T\mathrm{Pos}(K)\subseteq\mathrm{Pos}(K)$ holds, and their generators $A:\mathbb{R}[x_1,\
P. D. Dio, K. Schmüdgen
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