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Ježek, Jaroslav
Upper semicomplements and a definable element in the lattice of groupoid varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 3, pp. 565-586
MSC: 06B99, 08-30, 08A15, 08B15, 20-00, 20M14 | MR 0289398 | Zbl 0225.08007
References:
[1] A. D. BOL'BOT: O mnogoobrazijach $\Omegan$ -algebr. Algebra i logika, 9 (1970), 406-414. MR 0286733
[2] R. A. DEAN, T. EVANS: A remark on varieties of lattices and semigroups. Proc. Amer. Math. Soc. 21 (1969), 394-396. MR 0241509 | Zbl 0174.30602
[3] T. EVANS: The lattice of semigroup varieties. Semigroup Forum 2 (1971), 1-43. MR 0284528 | Zbl 0225.20043
[4] J. JEŽEK: Principal dual ideals in lattices of primitive classes. Comment. Math. Univ. Carolinae 9 (1968), 533-545. MR 0244131
[5] J. JEŽEK: On atoms in lattices of primitive classes. Comment. Math. Univ. Carolinae 11 (1970), 515-532. MR 0269571
[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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