Autor:	Don Pigozzi, W. J. Blok
Rok vydání:	1997
Předmět:	Discrete mathematics Lemma (mathematics) Pure mathematics Algebra and Number Theory Property (philosophy) Congruence (geometry) Quasivariety Mathematics::Number Theory Extension (predicate logic) Congruence relation Algebra over a field Mathematics
Zdroj:	Algebra Universalis. 38:391-394
ISSN:	1420-8911 0002-5240
DOI:	10.1007/s000120050060
Popis:	It is shown that a quasivariety has the extension property for all relative congruences if it has the extension property for principal relative congruences. This generalizes the analogous result for varieties, due to A. Day. The proof differs from Day's in that it avoids the use of Zorn's Lemma.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c0f5fcc7c01cc6ed1274005b80a8e7f https://doi.org/10.1007/s000120050060 Zobrazit plný text záznamu Full text from SpringerLink