Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/1400

TítuloGlobals of pseudovarieties of commutative semigroups : the finite basis problem, decidability and gaps
Autor(es)Almeida, Jorge
Azevedo, Assis
Data2001
EditoraCambridge University Press
RevistaProceedings of the Edinburgh Mathematical Society
Citação"Proceedings of the Edinburgh Mathematical Society". ISSN 0013-0915. 44 (2001) 27-47.
Resumo(s)Whereas pseudovarieties of commutative semigroups are known to be finitely based, the globals of monoidal pseudovarieties of commutative semigroups are shown to be finitely based (or of finite vertex rank) if and only if the index is 0, 1 or omega. Nevertheless, on these pseudovarieties, the operation of taking the global preserves decidability. Furthermore, the gaps between many of these globals are shown to be big in the sense that they contain chains which are order isomorphic to the reals.
Tipoarticle
URIhttp://hdl.handle.net/1822/1400
ISSN0013-0915
Arbitragem científicayes
AcessoopenAccess
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