| Title: | Upper semicomplements and a definable element in the lattice of groupoid varieties (English) | 
| Author: | Ježek, Jaroslav | 
| Language: | English | 
| Journal: | Commentationes Mathematicae Universitatis Carolinae | 
| ISSN: | 0010-2628 (print) | 
| ISSN: | 1213-7243 (online) | 
| Volume: | 12 | 
| Issue: | 3 | 
| Year: | 1971 | 
| Pages: | 565-586 | 
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| Category: | math | 
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| MSC: | 06B99 | 
| MSC: | 08-30 | 
| MSC: | 08A15 | 
| MSC: | 08B15 | 
| MSC: | 20-00 | 
| MSC: | 20M14 | 
| idZBL: | Zbl 0225.08007 | 
| idMR: | MR0289398 | 
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| Date available: | 2008-06-05T20:36:19Z | 
| Last updated: | 2012-04-27 | 
| Stable URL: | http://hdl.handle.net/10338.dmlcz/105366 | 
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| Reference: | [1] A. D. BOL'BOT: O mnogoobrazijach $\Omegan$ -algebr.Algebra i logika, 9 (1970), 406-414. MR 0286733 | 
| Reference: | [2] R. A. DEAN, T. EVANS: A remark on varieties of lattices and semigroups.Proc. Amer. Math. Soc. 21 (1969), 394-396. Zbl 0174.30602, MR 0241509 | 
| Reference: | [3] T. EVANS: The lattice of semigroup varieties.Semigroup Forum 2 (1971), 1-43. Zbl 0225.20043, MR 0284528 | 
| Reference: | [4] J. JEŽEK: Principal dual ideals in lattices of primitive classes.Comment. Math. Univ. Carolinae 9 (1968), 533-545. MR 0244131 | 
| Reference: | [5] J. JEŽEK: On atoms in lattices of primitive classes.Comment. Math. Univ. Carolinae 11 (1970), 515-532. MR 0269571 | 
| Reference: | [6] J. JEŽEK: The existence of upper semicomplements in lattices of primitive classes.Comment. Math. Univ. Carolinae 12 (1971), 519-532. MR 0292734 | 
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