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Hua's fundamental theorem of geometry of rectangular matrices over EAS division ringsSeguins Pazzis, Clément de ; Šemrl, PeterFundamentalni izrek geometrije pravokotnih matrik opiše splošno obliko bijekcij na prostoru ▫$m \times n$▫ matrik nad obsegom ▫$\mathbb{D}$▫, ki ohranjajo sosednost v obe smeri. V štiridesetih letih ... je ta izrek dokazal Hua, nedavno pa so bile dobljene nekatere izboljšave. Take preslikave lahko študiramo brez privzetka bijektivnosti, lastnost ohranjanja lahko nadomestimo s šibkejšo predpostavko, da se sosednost ohranja zgolj v eno smer in končno, preučujemo lahko še ohranjevalce sosednosti, ki delujejo mad prostori matrik različnih velikosti. Optimalni rezultat bi opisal preslikave, ki ohranjajo sosednost zgolj v eno smer in delujejo med prostori matrik različnih velikosti brez kakršnihkoli predpostavk o regularnosti (injektivnost ali surjektivnost). Obseg je EAS, če ni izomorfen nobenemu pravemu podobsegu. Že od prej je bilo znano, da je mogoče skonstruirati "divje" ohranjevalce sosednosti na matrikah nad obsegi, ki niso EAS. Za matrike nad EAS obsegi pa je bilo nedavno dokazano, da so ohranjevalci sosednosti med matričnimi prostori različnih dimenzij, ki zadoščajo neki šibki verziji surjektivnosti, bodisi degenerirani bodisi imajo pričakovano standardno obliko. To trditev dokažemo brez privzetka o šibki surjektivnosti in na ta način dokončno rešimo dolgo odprt problem o optimalni verziji Huajevega izreka.Source: Journal of algebra. - ISSN 0021-8693 (Vol. 439, 2015, str. 159-187)Type of material - article, component part ; adult, seriousPublish date - 2015Language - englishCOBISS.SI-ID - 17371993
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Seguins Pazzis, Clément de | |
Šemrl, Peter | 05953 |
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