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20L05 Groupoids (i.e. small categories in which all morphisms are isomorphisms) (49 articles)

• Grigor'yan, Alexander; Jimenez, Rolando; Muranov, Yuri: Fundamental groupoids of digraphs and graphs. (English). Czechoslovak Mathematical Journal, vol. 68 (2018), issue 1, pp. 35-65
• Grabowski, Janusz: An introduction to loopoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 57 (2016), issue 4, pp. 515-526
• Neuman, František: Coordinate description of analytic relations. (English). Mathematica Bohemica, vol. 131 (2006), issue 2, pp. 197-210
• Novotný, Miroslav: Construction of all homomorphisms of groupoids. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 1, pp. 141-153
• Pilitowska, Agata; Romanowska, Anna; Roszkowska-Lech, Barbara: Products of mode varieties and algebras of subalgebras. (English). Mathematica Slovaca, vol. 46 (1996), issue 5, pp. 497-514
• Zelinka, Bohdan: Representation of undirected graphs by anticommutative conservative groupoids. (English). Mathematica Bohemica, vol. 119 (1994), issue 3, pp. 231-237
• Satko, Ladislav: The tensor product of groupoids. (English). Mathematica Slovaca, vol. 44 (1994), issue 2, pp. 237-244
• Drápal, Aleš: On a class of commutative groupoids determined by their associativity triples. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 34 (1993), issue 2, pp. 199-201
• Zelinka, Bohdan: Tolerances on poset algebras. (English). Mathematica Bohemica, vol. 117 (1992), issue 1, pp. 93-97
• Kock, Anders: On the integration theorem for Lie groupoids. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 3, pp. 423-431
• Šipoš, Ján: On totally non-commutative convergence groupoids. (English). Mathematica Slovaca, vol. 39 (1989), issue 1, pp. 43-46
• Kubarski, Jan: Pradines-type groupoids. (English). In: Bureš, J. and Souček, V. (eds.): Proceedings of the Winter School "Geometry and Physics". Circolo Matematico di Palermo, Palermo, 1987. pp. [125]-143
• Vítek, Milan: Graphs and quasitrivial groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 27 (1986), issue 1, pp. 3-15
• Drápal, Aleš: Groupoids with non-associative triples on the diagonal. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 4, pp. 555-564
• Crvenković, Siniša; Dudek, Józef: Rectangular groupoids. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 3, pp. 405-414
• Kepka, Tomáš; Kratochvíl, Jan: Graphs and associative triples in quasitrivial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 4, pp. 679-687
• Ježek, Jaroslav; Kepka, Tomáš: Modular groupoids. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 3, pp. 477-487
• Ježek, Jaroslav; Kepka, Tomáš: Permutable groupoids. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 3, pp. 396-410
• Birkenmeier, Gary F.: Exponentiation without associativity. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 3-7
• Ježek, Jaroslav; Kepka, Tomáš: Notes on distributive groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 2, pp. 237-249
• Kepka, T.: One-element extensions of distributive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 24 (1983), issue 2, pp. 73-77
• Płonka, Jerzy: Subdirectly irreducible groupoids in some varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 4, pp. 631-645
• Ježek, Jaroslav; Kepka, Tomáš: Torsion groupoids. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 1, pp. 7-26
• Ježek, J.: Free groupoids in varieties determined by a short equation. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 23 (1982), issue 1, pp. 3-24
• Kučera, Luděk: On the monoids of homomorphisms of semigroups with unity. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 2, pp. 369-381
• Ježek, Jaroslav; Kepka, Tomáš: Free entropic groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 2, pp. 223-233
• Pollák, G.; Szendrei, Ágnes: Independent basis for the identities of entropic groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 1, pp. 71-85
• Kepka, Tomáš: Notes on associative triples of elements in commutative groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 2, pp. 39-47
• Kepka, Tomáš: Quasitrivial groupoids and balanced identities. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 2, pp. 49-64
• Dudek, Józef: Some remarks on distributive groupoids. (English). Czechoslovak Mathematical Journal, vol. 31 (1981), issue 3, pp. 451-456
• Ajmal, Naseem: Groupoids with a closure condition. (English). Časopis pro pěstování matematiky, vol. 105 (1980), issue 1, pp. 14-22
• Kepka, Tomáš: A note on associative triples of elements in cancellation groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 3, pp. 479-487
• Lee, Sin Min: On a simple one-element extension of left zero semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 2, pp. 313-318
• Šipoš, Ján: On convergence groupoids. (English). Mathematica Slovaca, vol. 30 (1980), issue 2, pp. 163-173
• Kepka, Tomáš: Medial division groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 20 (1979), issue 1, pp. 41-60
• Pondělíček, Bedřich: On the intersection graph of a commutative distributive groupoid. (English). Mathematica Slovaca, vol. 29 (1979), issue 1, pp. 57-62
• Kepka, Tomáš; Němec, P.: Quasigroups whose regular mappings are automorphisms. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 20 (1979), issue 1, pp. 61-71
• Kepka, Tomáš: Epimorphisms in some groupoid varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 2, pp. 265-279
• Sathyabhama, V.: Generalized LC-identity on GD-groupoids. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 270-274
• Poncová, Lenka: Группоиды с мультиоператорами. (Russian) [Groupoids with multioperators]. Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika, vol. 16 (1977), issue 1, pp. 5-28
• Klouda, Josef: Eine Bemerkung über ausgezeichnete Kongruenzrelationen der Brandtschen Gruppoiden. (German) [A remark on good congruences of Brandt groupoids]. Commentationes Mathematicae Universitatis Carolinae, vol. 16 (1975), issue 2, pp. 277-291
• Kepka, Tomáš: $\Lambda$, $R$-transitive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 16 (1975), issue 2, pp. 71-77
• Kepka, Tomáš: Normal congruence relations on division groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 16 (1975), issue 2, pp. 89-95
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of commutative idempotent Abelian groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 16 (1975), issue 3, pp. 487-500
• Pócs, Jozef: Translations in Idempotent Groupoids. (English). Matematický časopis, vol. 25 (1975), issue 4, pp. 361-368
• Havel, Václav: Universality property of free groupoid extensions of halfgroupoids and its geometrical meaning. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 4, pp. 562-567
• Sedláček, Ladislav: Zum Problem der inneren direkten Produkte von Gruppoiden. (German) [On the problem of direct inner product of grupoids]. Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika, vol. 13 (1973), issue 1, pp. 27-38
• Kepka, Tomáš: A note on compatible reflexive relations on quasigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 3, pp. 593-598
• Hrmová, Renáta: Partial groupoids with some associativity conditions. (English). Matematický časopis, vol. 21 (1971), issue 4, pp. 285-311