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On the complexity of the lattices of subvarieties and congruences. II. Differential groupoids and unary algebras. / Kravchenko, A. V.; Schwidefsky, M. V.
в: Сибирские электронные математические известия, Том 17, 01.06.2020, стр. 753-768.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - On the complexity of the lattices of subvarieties and congruences. II. Differential groupoids and unary algebras
AU - Kravchenko, A. V.
AU - Schwidefsky, M. V.
N1 - Publisher Copyright: © 2020 Kravchenko A.V., Schwidefsky M.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - We prove that certain lattices can be represented as the lattices of relative subvarieties and relative congruences of differential groupoids and unary algebras. This representation result implies that there are continuum many quasivarieties of differential groupoids such that the sets of isomorphism types of finite sublattices of their lattices of relative subvarieties and congruences are not computable. A similar result is obtained for unary algebras and their lattices of relative congruences.
AB - We prove that certain lattices can be represented as the lattices of relative subvarieties and relative congruences of differential groupoids and unary algebras. This representation result implies that there are continuum many quasivarieties of differential groupoids such that the sets of isomorphism types of finite sublattices of their lattices of relative subvarieties and congruences are not computable. A similar result is obtained for unary algebras and their lattices of relative congruences.
KW - Computable set
KW - Congruence lattice
KW - Differential groupoid
KW - Quasivariety
KW - Unary algebra
KW - Undecidable problem
KW - Variety
UR - http://www.scopus.com/inward/record.url?scp=85089221682&partnerID=8YFLogxK
U2 - 10.33048/SEMI.2020.17.054
DO - 10.33048/SEMI.2020.17.054
M3 - Article
AN - SCOPUS:85089221682
VL - 17
SP - 753
EP - 768
JO - Сибирские электронные математические известия
JF - Сибирские электронные математические известия
SN - 1813-3304
ER -
ID: 24960860