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1.
A note on spectrum-preserving maps
J. Alaminos, Matej Brešar, Peter Šemrl, A. R. Villena, 2012, original scientific article

Abstract: Naj bosta ▫$A$▫ in ▫$B$▫ enotski polenostavni Banachovi algebri. Če je ▫$phi colon M_2(A)to B$▫ bijektivna linearna preslikava, ki ohranja spekter, potem je ▫$phi$▫ jordanski homomorfizem.
Keywords: matematika, teorija operatorjev, ohranjevalec spektera, Banachova algebra, jordanski homomorfizem, mathematics, operator theory, spectrum-preserving map, Banach algebra, Jordan homomorphism
Published in DKUM: 10.07.2015; Views: 1528; Downloads: 114
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2.
Characterizing Jordan maps on C [ast]-algebras through zero products
J. Alaminos, Matej Brešar, J. Extremera, A. R. Villena, 2010, original scientific article

Abstract: Naj bosta ▫$A$▫ in ▫$B$▫ ▫$C^ast$▫-algebri, ▫$X$▫ naj bo bistveni Banachov ▫$A$▫-bimodul in naj bosta ▫$T colon A to B$▫ in ▫$S colon A to X$▫ zvezni linearni preslikavi; ▫$T$▫ naj bo surjektivna. Denimo, da je ▫$T(a)T(b) + T(b)T(a) = 0$▫ in ▫$S(a)b + bS(a) + aS(b) + S(b)a = 0$▫, kadarkoli ▫$a, b in A$▫ zadoščata ▫$ab = ba = 0$▫. Dokažemo, da je ▫$T = wPhi$▫ in ▫$S = D + wPsi$▫, kjer ▫$w$▫ leži v centru multiplikatorske algebre ▫$B$▫, ▫$Phicolon A to B$▫ je jordanski epimorfizem, ▫$D colon A to X$▫ je odvajanje in ▫$Psi colon A to X$▫ je bimodulski homomorfizem.
Keywords: matematika, teorija operatorjev, ▫$C^ast$▫-algebra, homomorfizem, jordanski homomorfizem, odvajanje, jordansko odvajanje, ohranjevalec ničelnega produkta, mathematics, operator theory, ▫$C^ast$▫-algebra, homomorphism, Jordan homomorphism, derivation, Jordan derivation, zero-product-preserving map
Published in DKUM: 10.07.2015; Views: 1114; Downloads: 47
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3.
Jordan homomorphisms revisited
Matej Brešar, 2008, original scientific article

Abstract: Naj bo ▫$theta$▫ jordanski homomorfizem iz algebre ▫$A$▫ v algebro ▫$B$▫. Poiskani so različni pogoji, iz katerih sledi, da je zožitev ▫$theta$▫ na komutatorski ideal ▫$A$▫ vsota homomorfizma in antihomomorfizma. Algebraični rezultati, dobljeni v prvem delu članka, so uporabljeni v drugem delu, ki obravnava primer, ko sta ▫$A$▫ in ▫$B$▫ ▫$C^ast$▫-algebri.
Keywords: matematika, algebra, jordanski homomorfizem, algebra, ▫$C^ast$▫-algebra, mathematics, algebra, Jordan homomorphism, algebra, ▫$C^ast$▫-algebra
Published in DKUM: 10.07.2015; Views: 945; Downloads: 89
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4.
Jordan homomorphisms on triangular matrices
Dominik Benkovič, 2005, original scientific article

Abstract: Let ▫${mathcal{T}}_n(mathcal{C})$▫ be the algebra of all ▫$n times n$▫ upper triangular matrices over a commutative unital ring ▫$mathcal{C}$▫. We describe the structure of Jordan homomorphisms from ▫${mathcal{T}}_n(mathcal{C})$▫ into an arbitrary algebra over ▫$mathcal{C}$▫. As an application a new proof of our recent result on Jordan derivations on ▫${mathcal{T}}_n(mathcal{C})$▫ is obtained.
Keywords: matematika, algebra zgornje trikotnih matrik, jordanski homomorfizem, jordansko odvajanje, mathematics, triangular matrix algebra, Jordan homomorphism, Jordan derivation
Published in DKUM: 10.07.2015; Views: 1285; Downloads: 94
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