Globals of pseudovarieties of commutative semigroups : the finite basis problem, decidability and gaps
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 operati...
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| Formato: | article |
| Idioma: | eng |
| Publicado em: |
2001
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| Texto completo: | http://hdl.handle.net/1822/1400 |
| País: | Portugal |
| Oai: | oai:repositorium.sdum.uminho.pt:1822/1400 |