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20M14 Commutative semigroups (59 articles)

• Moreno-Frías, María Ángeles; Rosales, José Carlos: The covariety of perfect numerical semigroups with fixed Frobenius number. (English). Czechoslovak Mathematical Journal, vol. 74 (2024), issue 3, pp. 697-714
• Moreno-Frías, Maria Angeles; Rosales, José Carlos: The lattice of ideals of a numerical semigroup and its Frobenius restricted variety associated. (English). Mathematica Bohemica, vol. 149 (2024), issue 3, pp. 439-454
• Krause, Ulrich; Maney, Jack; Ponomarenko, Vadim: Diversity in inside factorial monoids. (English). Czechoslovak Mathematical Journal, vol. 62 (2012), issue 3, pp. 811-827
• Maney, Jack; Ponomarenko, Vadim: Diversity in monoids. (English). Czechoslovak Mathematical Journal, vol. 62 (2012), issue 3, pp. 795-809
• Kepka, Tomáš; Němec, Petr: (Pre)order preserving additive homomorphisms of (pre)ordered commutative semigroups into real numbers. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 53 (2012), issue 1, pp. 3-32
• Ježek, Jaroslav; Kepka, Tomáš; Němec, Petr: Commutative semigroups that are simple over thein endomorphism semirings. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 52 (2011), issue 2, pp. 37-50
• Ježek, Jaroslav; Kepka, Tomáš; Němec, Petr: Commutative semigroups with almost transitive endomorphism semirings. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 52 (2011), issue 2, pp. 29-32
• Ježek, J.; Kepka, T.; Němec, P.: Commutative zeropotent semigroups with few prime ideals. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 52 (2011), issue 4, pp. 501-505
• Ježek, Jaroslav; Kepka, Tomáš; Němec, Petr: One element extensions of commutative semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 52 (2011), issue 2, pp. 33-35
• Cegarra, Antonio M.; Petrich, Mario: The rank of a commutative semigroup. (English). Mathematica Bohemica, vol. 134 (2009), issue 3, pp. 301-318
• Ježek, Jaroslav; Kepka, Tomáš; Němec, Petr: Commutative semigroups that are nil of index 2 and have no irreducible elements. (English). Mathematica Bohemica, vol. 133 (2008), issue 1, pp. 1-7
• Bashir, Robert El; Kepka, Tomáš: Commutative zeropotent semigroups with few invariant congruences. (English). Czechoslovak Mathematical Journal, vol. 58 (2008), issue 4, pp. 865-885
• Rosales, J. C.; Vasco, P.: On the Frobenius number of a modular Diophantine inequality. (English). Mathematica Bohemica, vol. 133 (2008), issue 4, pp. 367-375
• Halter-Koch, Franz: The tame degree and related invariants of non-unique factorizations. (English). Acta Mathematica Universitatis Ostraviensis, vol. 16 (2008), issue 1, pp. 57-68
• Chang, SooAh; Chapman, Scott T.; Smith, William W.: Elasticity in certain block monoids via the Euclidean table. (English). Mathematica Slovaca, vol. 57 (2007), issue 5, pp. [415]-454
• Butkiewicz, Bohdan: Some properties of $B$-operations. (English). Kybernetika, vol. 43 (2007), issue 2, pp. 197-208
• Flaška, Václav; Jančařík, Antonín; Kala, Vítězslav; Kepka, Tomáš: Trees in commtative nil-semigroups of index two. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 48 (2007), issue 1, pp. 81-101
• Flaška, Václav; Kepka, Tomáš: Commutative zeropotent semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 47 (2006), issue 1, pp. 3-14
• Bashir, Robert El; Kepka, Tomáš; Kechlibar, Marian: Commutative semigroups with few fully invariant congruences I. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 46 (2005), issue 1, pp. 49-64
• Bashir, Robert El; Kepka, Tomáš; Kechlibar, Marian: Commutative semigroups with few fully invariant congruences II. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 46 (2005), issue 1, pp. 65-75
• Rosales, J. C.; García-Sánchez, P. A.; García-García, J. I.; Branco, M. B.: Numerical semigroups with a monotonic Apéry set. (English). Czechoslovak Mathematical Journal, vol. 55 (2005), issue 3, pp. 755-772
• Halter-Koch, Franz: Ideal-theoretic characterizations of valuation and Prüfer monoids. (English). Archivum Mathematicum, vol. 40 (2004), issue 1, pp. 41-46
• Příhoda, Pavel: Bases of minimal elements of some partially ordered free abelian groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 44 (2003), issue 4, pp. 623-628
• Rosales, J. C.; García-García, J. I.: Principal ideals of finitely generated commutative monoids. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 1, pp. 75-85
• Bashir, Robert El; Ježek, Jaroslav; Kepka, Tomáš: Simple zeropotent paramedial groupoids are balanced. (English). Czechoslovak Mathematical Journal, vol. 50 (2000), issue 2, pp. 397-399
• Geroldinger, Alfred: On the structure and arithmetic of finitely primary monoids. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 4, pp. 677-695
• Močkoř, Jiří; Kontolatou, Angeliki: Some remarks on Lorenzen $r$-group of partly ordered groups. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 3, pp. 537-552
• Pondělíček, Bedřich: On generalized conditionally commutative semigroups. (English). Mathematica Slovaca, vol. 44 (1994), issue 3, pp. 359-364
• Mlček, Josef: Monotonic valuations of $\pi \sigma $-triads and evaluations of ideals. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 34 (1993), issue 1, pp. 23-32
• Geroldinger, A.; Halter-Koch, Franz: Non-unique factorizations in block semigroups and arithmetical applications. (English). Mathematica Slovaca, vol. 42 (1992), issue 5, pp. 641-661
• Kelarev, A. V.: On the Jacobson radical of graded rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 1, pp. 21-24
• Halter-Koch, Franz: Relative block semigroups and their arithmetical applications. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 3, pp. 373-381
• Mlček, Josef: Valuations of lines. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 33 (1992), issue 4, pp. 667-679
• Puš, Vladimír: Combinatorial properties of products of graphs. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 2, pp. 269-277
• Mareš, Milan: Addition of rational fuzzy quantities: Convolutive approach. (English). Kybernetika, vol. 25 (1989), issue 1, pp. 1-11,12
• Puš, Vladimír: Algebraic and combinatorial properties of products [Abstract of thesis]. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 1, pp. 200
• Puš, Vladimír: Representation of semigroups by products of simple graphs. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 2, pp. 227-234
• Pondělíček, Bedřich: Commutative semigroups whose lattice of tolerances is Boolean. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 2, pp. 226-230
• Pondělíček, Bedřich: Direct decomposability of tolerances and congruences on semigroups. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 4, pp. 701-704
• Chandran, V. R.: On a problem of B. Zelinka. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 1, pp. 124
• Chandran, V. R.: On a problem of B. Zelinka, II. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 1, pp. 125-127
• Rachůnek, Jiří: Prime ideals in autometrized algebras. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 1, pp. 65-69
• Johnson, E. W.: Primary factorization in semigroups. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 2, pp. 180-184
• Trnková, Věra: Countable Hausdorff spaces with countable weight. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 26 (1985), issue 4, pp. 749-770
• Pondělíček, Bedřich: Modularity and distributivity of tolerance lattices of commutative separative semigroups. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 2, pp. 333-337
• Karásek, Jiří: A remark concerning $x$-systems. (English). Archivum Mathematicum, vol. 21 (1985), issue 3, pp. 177-179
• Goralčík, Pavel; Koubek, Václav: On the right action hierarchy of semigroups. (English). Mathematica Slovaca, vol. 34 (1984), issue 2, pp. 199-203
• Pondělíček, Bedřich: Atomicity of tolerance lattices of commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 3, pp. 485-498
• Vinárek, Jiří: Representations of commutative semigroups by products of metric $0$-dimensional spaces. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 4, pp. 715-726
• Galanová, Jana: Тензорное произведение полугруппы и полугруппы идемпотентов. (Russian) [The tensor product of a semigroup and semigroups of idempotents]. Mathematica Slovaca, vol. 32 (1982), issue 1, pp. 55-60
• Vinárek, J.: Isomorphisms of products. (English). In: Frolík, Zdeněk (ed.): Abstracta. 9th Winter School on Abstract Analysis. Czechoslovak Academy of Sciences, Praha, 1981. pp. 185-191
• Skula, Ladislav: On $\delta n$-semigroups. (English). Archivum Mathematicum, vol. 17 (1981), issue 1, pp. 43-52
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of medial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 3, pp. 513-524
• Glastad, Bruce; Hopkins, Glenn: Commutative semigroup rings which are principal ideal rings. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 2, pp. 371-377
• Ajmal, Naseem: Groupoids with a closure condition. (English). Časopis pro pěstování matematiky, vol. 105 (1980), issue 1, pp. 14-22
• Ježek, Jaroslav: Terms and semiterms. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 3, pp. 447-460
• 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
• Skula, Ladislav: Prime elements in the semigroup of finite types of partially ordered sets in cardinal multiplication. (English). Archivum Mathematicum, vol. 4 (1968), issue 2, pp. 97-101
• Fabrici, Imrich: Poznámka o $F$-triedách v komutatívných Hausdorffových bikompaktních pologrupách. (Slovak) [A Note on $F$-Classes in Commutative Hausdorff Bicompact Semigroups]. Matematicko-fyzikálny časopis, vol. 11 (1961), issue 4, pp. 282-287