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20M07 Varieties of semigroups (30 articles)

• Petrich, Mario: Bases for certain varieties of completely regular semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 62 (2021), issue 1, pp. 41-65
• Petrich, Mario: Relations on a lattice of varieties of completely regular semigroups. (English). Mathematica Bohemica, vol. 145 (2020), issue 3, pp. 225-240
• Petrich, Mario: A semilattice of varieties of completely regular semigroups. (English). Mathematica Bohemica, vol. 145 (2020), issue 1, pp. 1-14
• Petrich, Mario: Characterizing pure, cryptic and Clifford inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 64 (2014), issue 4, pp. 1099-1112
• Vernikov, Boris M.: On modular elements of the lattice of semigroup varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 48 (2007), issue 4, pp. 595-606
• Demlová, Marie; Koubek, Václav: On universality of semigroup varieties. (English). Archivum Mathematicum, vol. 42 (2006), issue 4, pp. 357-386
• Demlová, M.; Koubek, V.: Weak alg-universality and $Q$-universality of semigroup quasivarieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 46 (2005), issue 2, pp. 257-279
• Polák, Libor: A classification of rational languages by semilattice-ordered monoids. (English). Archivum Mathematicum, vol. 40 (2004), issue 4, pp. 395-406
• Sen, M. K.; Maity, S. K.: A note on orthodox additive inverse semirings. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 43 (2004), issue 1, pp. 149-154
• Sen, M. K.; Maity, S. K.: Semirings embedded in a completely regular semiring. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 43 (2004), issue 1, pp. 143-148
• Thron, R.; Koppitz, J.: Lattice-theoretically characterized classes of finite bands. (English). Archivum Mathematicum, vol. 39 (2003), issue 1, pp. 1-10
• Dudek, Józef: Small idempotent clones. I. (English). Czechoslovak Mathematical Journal, vol. 48 (1998), issue 1, pp. 105-118
• Kuřil, Martin: A multiplication of e-varieties of regular $E$-solid semigroups by inverse semigroup varieties. (English). Archivum Mathematicum, vol. 33 (1997), issue 3, pp. 279-299
• Kuřil, Martin: A multiplication of $e$-varieties of orthodox semigroups. (English). Archivum Mathematicum, vol. 31 (1995), issue 1, pp. 43-54
• Denecke, K.; Koppitz, J.: Pre-solid varieties of semigroups. (English). Archivum Mathematicum, vol. 31 (1995), issue 3, pp. 171-181
• Drápal, Aleš; Kepka, Tomáš; Musílek, Michal: Group conjugation has non-trivial LD-identities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 35 (1994), issue 2, pp. 219-222
• Antonippillai, A.; Pastijn, Francis: Subsemigroups of completely simple semigroups. III. (English). Mathematica Slovaca, vol. 44 (1994), issue 2, pp. 263-278
• Auinger, Karl: Free locally inverse *-semigroups. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 3, pp. 523-545
• Krapež, A.; Taylor, M. A.: Irreducible Belousov equations on quasigroups. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 1, pp. 157-175
• Pondělíček, Bedřich: Subalgebra modular, distributive and boolean varieties of semigroups. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 4, pp. 757-764
• Pondělíček, Bedřich: On permutability in semigroup varieties. (English). Mathematica Bohemica, vol. 116 (1991), issue 4, pp. 396-400
• Pondělíček, Bedřich: On varieties of regular $*$-semigroups. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 1, pp. 110-119
• Pondělíček, Bedřich: On varieties of regular $*$-semigroups, II. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 3, pp. 512-517
• Koubek, Václav: Representations in varieties of regular involution bands. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 31 (1990), issue 2, pp. 201-211
• Pondělíček, Bedřich: Tolerance modular varieties of semigroups. (English). Czechoslovak Mathematical Journal, vol. 40 (1990), issue 3, pp. 441-452
• Zejnullahu, A.: Splitting left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 30 (1989), issue 1, pp. 23-27
• Pondělíček, Bedřich: Tolerance distributive and tolerance Boolean varieties of semigroups. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 4, pp. 617-622
• Pondělíček, Bedřich: Tolerance distributive and tolerance modular varieties of commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 3, pp. 485-488
• Kepka, T.: Varieties of left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 25 (1984), issue 1, pp. 3-18
• 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