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Upper semicomplements and a definable element in the lattice of groupoid varieties
Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 3, pp. 565-586 Cet article a éte moissonné depuis la source Czech Digital Mathematics Library

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Classification : 06B99, 08-30, 08A15, 08B15, 20-00, 20M14 
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Ježek, Jaroslav. Upper semicomplements and a definable element in the lattice of groupoid varieties. Commentationes Mathematicae Universitatis Carolinae, Tome 12 (1971) no. 3, pp. 565-586. http://geodesic.mathdoc.fr/item/CMUC_1971_12_3_a8/

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[6] J. JEŽEK: The existence of upper semicomplements in lattices of primitive classes. Comment. Math. Univ. Carolinae 12 (1971), 519-532. | MR