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Adjacency preserving maps on hermitian matricesHuang, Wen-ling ; Šemrl, PeterHuajev fundamentalni izrek geometrije hermitskih matrik karakterizira bijektivne preslikave na množici vseh ▫$n \times n$▫ hermitskih matrik, ki ohranjajo sosednost v obe smeri. Že kar nekaj časa je ... bilo odprto vprašanje možnih izboljšav. Pri tem mislimo na naslednja tri vprašanja. Ali potrebujemo predpostavko bijektivnosti? Ali lahko nadomestimo predpostavko o ohranjanju sosednosti v obe smeri s šibkejšo predpostavko, da se sosednost ohranja le v eno smer? Ali lahko Huajev rezultat posplošimo na preslikave med množicami hermitskih matrik različnih velikosti? Na vsa tri vprašanja hkrati odgovorimo pritrdilno in s tem dokažemo optimalno verzijo tega klasičnega Huajevega izreka.Source: Canadian journal of mathematics = Journal canadien de mathématiques. - ISSN 0008-414X (Vol. 60, no. 5, 2008, str. 1050-1066)Type of material - article, component partPublish date - 2008Language - englishCOBISS.SI-ID - 14901337
Author
Huang, Wen-ling |
Šemrl, Peter
Topics
matematika |
linearna algebra |
hermitske matrike |
ohranjevalci sosednosti |
geometrija matrik |
rang |
mathematics |
linear algebra |
rank |
adjacency preserving map |
hermitian matrix |
geometry of matrices
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source: Canadian journal of mathematics = Journal canadien de mathématiques. - ISSN 0008-414X (Vol. 60, no. 5, 2008, str. 1050-1066)
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Huang, Wen-ling | ![]() |
Šemrl, Peter | 05953 |
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