Quasi-identities of finite semigroups and symbolic dynamics
Author(s) -
Stuart Margolis,
Mark Sapir
Publication year - 1995
Publication title -
israel journal of mathematics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.168
H-Index - 63
eISSN - 1565-8511
pISSN - 0021-2172
DOI - 10.1007/bf02762086
Subject(s) - mathematics , finitely generated abelian group , semigroup , variety (cybernetics) , pure mathematics , krohn–rhodes theory , algebra over a field , stallings theorem about ends of groups , special classes of semigroups , discrete mathematics , statistics
An algebra is inherently non-finitely (Q-)based if it is not a member of any locally finite (quasi-)variety, whose (quasi-)identities are finitely based. We prove that no finite semigroup is inherently non-finitely Q-based. This is in marked contrast to the case of varieties, where there are many inherently non-finitely based finite semigroups which have all been described by the second author.
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