نتایج جستجو برای: nonlinear preserver

تعداد نتایج: 219120  

Journal: :bulletin of the iranian mathematical society 2011
m. radjabalipour p. torabian

2000
Alexander Guterman Chi-Kwong Li Peter Šemrl

Several general techniques on linear preserver problems are described. The first one is based on a transfer principle in Model Theoretic Algebra that allows one to extend linear preserver results on complex matrices to matrices over other algebraically closed fields of characteristic 0. The second one concerns the use of some simple geometric technique to reduce linear preserver problems to sta...

Journal: :Electr. J. Comb. 2006
Richard A. Brualdi Martin Loebl Ondrej Pangrác

For two bipartite graphs G and G , a bijection ψ : E(G) → E(G) is called a (perfect) matching preserver provided that M is a perfect matching in G if and only if ψ(M) is a perfect matching in G. We characterize bipartite graphs G and G which are related by a matching preserver and the matching preservers between them.

2010
MICHAEL W. TROSSET

Short proofs are given to various characterizations of the (circum-)Euclidean squared distance matrices. Linear preserver problems related to these matrices are discussed.

2008
Graham A. Davis Alexandra M. Newman

If you are in a shipwreck and all the boats are gone, a piano top...that comes along makes a fortuitous life preserver. But this is not to say that the best way to design a life preserver is in the form of a piano top. I think that we are clinging to a great many piano tops in accepting yesterday’s fortuitous contrivings as constituting the only means for solving a given problem. (Fuller 1969, ...

2011
Jayanthkumar Kannan Petros Maniatis Byung-Gon Chun

We examine a novel proposal wherein a user who hands off her data to a web service has complete choice over the code and policies that constrain access to her data. Such an approach is possible if the web service does not require raw access to the user’s data to implement its functionality; access to a carefully chosen interface to the data suffices. Our data preserver framework rearchitects su...

Journal: :Bulletin of the Korean Mathematical Society 2005

2010
Chi-Kwong Li Thomas Milligan Michael W. Trosset MICHAEL W. TROSSET

Short proofs are given to various characterizations of the (circum-)Euclidean squared distance matrices. Linear preserver problems related to these matrices are discussed.

Journal: :Linear Algebra and its Applications 2003

2011
BOJAN KUZMA LEIBA RODMAN

Norm preserver maps of Jordan product on the algebra Mn of n×n complex matrices are studied, with respect to various norms. A description of such surjective maps with respect to the Frobenius norm is obtained: Up to a suitable scaling and unitary similarity, they are given by one of the four standard maps (identity, transposition, complex conjugation, and conjugate transposition) on Mn, except ...

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