• DML-CZ Home

08A05 Structure theory (117 articles)

• Jun, Jaiung; Mincheva, Kalina; Rowen, Louis: $\mathcal {T}$-semiring pairs. (English). Kybernetika, vol. 58 (2022), issue 5, pp. 733-759
• Martín, Antonio J. Calderón; Dieme, Boubacar: Certain partitions on a set and their applications to different classes of graded algebras. (English). Communications in Mathematics, vol. 29 (2021), issue 2, pp. 243-254
• Stanovský, David: Abelian differential modes are quasi-affine. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 53 (2012), issue 3, pp. 461-473
• Pilitowska, Agata: Linear identities in graph algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 50 (2009), issue 1, pp. 11-24
• Drápal, Aleš: A class of commutative loops with metacyclic inner mapping groups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 49 (2008), issue 3, pp. 357-382
• Chajda, I.; Kolařík, M.: Directoids with sectionally antitone involutions and skew MV-algebras. (English). Mathematica Bohemica, vol. 132 (2007), issue 4, pp. 407-422
• Zamojska-Dzienio, Anna: Medial modes and rectangular algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 47 (2006), issue 1, pp. 21-34
• Haviar, Alfonz; Monoszová, Gabriela: Constructions of cell algebras. (English). Mathematica Bohemica, vol. 130 (2005), issue 1, pp. 89-100
• Romanowska, Anna; Zamojska-Dzienio, Anna: Embedding sums of cancellative modes into semimodules. (English). Czechoslovak Mathematical Journal, vol. 55 (2005), issue 4, pp. 975-991
• Chajda, Ivan; Šešelja, Branimir; Tepavčević, Andreja: A note on triangular schemes for weak congruences. (English). Czechoslovak Mathematical Journal, vol. 55 (2005), issue 3, pp. 683-690
• Machala, František; Slezák, Vladimír: Join-closed and meet-closed subsets in complete lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 43 (2004), issue 1, pp. 113-117
• Drápal, Aleš: On multiplication groups of left conjugacy closed loops. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 45 (2004), issue 2, pp. 223-236
• Bělohlávek, Radim: Convex sets in algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 41 (2002), issue 1, pp. 21-33
• Szabó, László: Infinite algebras with 3-transitive groups of weak automorphisms. (English). Archivum Mathematicum, vol. 37 (2001), issue 4, pp. 245-256
• Chajda, Ivan: Characterizing binary discriminator algebras. (English). Mathematica Bohemica, vol. 125 (2000), issue 4, pp. 497-504
• Jakubíková-Studenovská, Danica: DR-irreducibility of connected monounary algebras. (English). Czechoslovak Mathematical Journal, vol. 50 (2000), issue 4, pp. 705-720
• Jakubíková-Studenovská, Danica: DR-irreducibility of connected monounary algebras with a cycle. (English). Czechoslovak Mathematical Journal, vol. 50 (2000), issue 4, pp. 681-698
• Pióro, Konrad: On some non-obvious connections between graphs and unary partial algebras. (English). Czechoslovak Mathematical Journal, vol. 50 (2000), issue 2, pp. 295-320
• Chajda, Ivan; Graczyńska, Ewa: Algebras presented by normal identities. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 38 (1999), issue 1, pp. 49-58
• Chajda, I.; Pinus, A.; Denisov, A.: Lattices of quasiorders on universal algebras. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 2, pp. 291-301
• Romanowska, Anna: On reductive and distributive algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 40 (1999), issue 4, pp. 617-629
• Chajda, Ivan; Halaš, Radomír; Zedník, Josef: Filters and annihilators in implication algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 37 (1998), issue 1, pp. 41-45
• Płonka, Jerzy: Clone compatible identities and clone extensions of algebras. (English). Mathematica Slovaca, vol. 47 (1997), issue 3, pp. 231-249
• Chajda, Ivan; Halaš, Radomír; Machala, František: Congruences and ideals in ternary rings. (English). Czechoslovak Mathematical Journal, vol. 47 (1997), issue 1, pp. 163-172
• Ježek, Jaroslav: Enumerating left distributive groupoids. (English). Czechoslovak Mathematical Journal, vol. 47 (1997), issue 4, pp. 717-727
• Walendziak, Andrzej: Existence and uniqueness of $(L,\varphi)$-representations of algebras. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 1, pp. 35-46
• Sesboüé, André: Finite monogenic distributive systems. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 4, pp. 697-719
• Chajda, I.; Rosenberg, I. G.: Ideals and congruence kernels of algebras. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 4, pp. 733-744
• Szendrei, Ágnes: Nearly-idempotent plain algebras are indeed nearly idempotent plain algebras. (English). Mathematica Slovaca, vol. 46 (1996), issue 4, pp. 391-403
• 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
• Chajda, Ivan; Emanovský, Petr: $\Sigma$-Hamiltonian and $\Sigma$-regular algebraic structures. (English). Mathematica Bohemica, vol. 121 (1996), issue 2, pp. 177-182
• Chajda, Ivan; Emanovský, Petr: Modularity and distributivity of the lattice of $\Sigma$-closed subsets of an algebraic structure. (English). Mathematica Bohemica, vol. 120 (1995), issue 2, pp. 209-217
• Chajda, Ivan; Emanovský, Petr: $\Sigma$-isomorphic algebraic structures. (English). Mathematica Bohemica, vol. 120 (1995), issue 1, pp. 71-81
• Chajda, Ivan; Halaš, Radomír: Genomorphisms of lattices and semilattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 23-27
• Halaš, Radomír: A note on homotopy in universal algebra. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 39-42
• Pinus, Alexander G.; Michailov, M. M.: On the approximation of the Boolean powers by Cartesian powers. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 105-108
• Walendziak, Andrzej: $(L,\varphi)$-representations of algebras. (English). Archivum Mathematicum, vol. 29 (1993), issue 2, pp. 135-143
• Duda, Jaromír: Subcoherent algebras. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 2, pp. 281-284
• Chajda, Ivan: Subdirectly irreducible algebras of quasiordered logics. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 32 (1993), issue 1, pp. 21-26
• Bandelt, Hans-Jürgen; Meletiou, Gerasimos C.: The zero-completion of a median algebra. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 3, pp. 409-417
• Duda, Jaromír: Coherence and weak coherence in the square of algebras. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 4, pp. 613-618
• Duda, Jaromír: Tolerances on powers of a finite algebra. (English). Mathematica Bohemica, vol. 117 (1992), issue 3, pp. 299-304
• Gardner, Barry J.: How to make many-sorted algebras one-sorted. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 30 (1989), issue 4, pp. 627-635
• Grätzer, G.; Wenzel, G. H.: Tolerances, covering systems, and the axiom of choice. (English). Archivum Mathematicum, vol. 25 (1989), issue 1, pp. 27-34
• Pöschel, Reinhard; Wessel, Walter: Classes of graphs definable by graph algebra identities or quasi-identities. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 28 (1987), issue 3, pp. 581-592
• Novák, Vítězslav: Universal cyclic relations. (English). Archivum Mathematicum, vol. 22 (1986), issue 3, pp. 125-128
• Novák, Vítězslav: On a power of relational structures. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 1, pp. 167-172
• Novák, Vítězslav; Novotný, Miroslav: Universal cyclically ordered sets. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 1, pp. 158-161
• Rachůnek, Jiří: On algebra-lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 23 (1984), issue 1, pp. 5-10
• Ursini, Aldo: Prime ideals in universal algebras. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 25 (1984), issue 1, pp. 75-87
• Kepka, Tomáš: Distributive groupoids and preradicals. I. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 1, pp. 183-197
• Kepka, Tomáš: Distributive groupoids and preradicals. II. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 24 (1983), issue 2, pp. 199-209
• 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
• Novotný, Miroslav: Remarks on heterogeneous algebras. (English). Časopis pro pěstování matematiky, vol. 107 (1982), issue 4, pp. 397-406
• Demlová, M.; Demel, Jiří; Koubek, Václav: Simplicity of algebras requires to investigate almost all operations. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 2, pp. 325-335
• Švrček, Jaroslav: A contribution to the theory of decompositions of partial algebras. (English). Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika, vol. 20 (1981), issue 1, pp. 23-25
• Kopeček, Ivan: Distinguishing subsets in general algebras. (English). Časopis pro pěstování matematiky, vol. 106 (1981), issue 1, pp. 94-100
• Mlček, Josef: Monotonic valuations and valuations of triads of higher types. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 2, pp. 377-398
• Kepka, Tomáš: Notes on left distributive groupoids. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 22 (1981), issue 2, pp. 23-37
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of medial groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 22 (1981), issue 3, pp. 513-524
• Andréka, H.; Németi, I.: Does ${\bf SP}\ K\supseteq\ {\bf PS}\ K$ imply axiom of choice?. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 21 (1980), issue 4, pp. 699-706
• 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
• Chajda, Ivan: Relational classes and their characterizations. (English). Archivum Mathematicum, vol. 16 (1980), issue 4, pp. 199-203
• Šik, František: Schreier-Zassenhaus theorem for algebras. I. (English). Czechoslovak Mathematical Journal, vol. 30 (1980), issue 2, pp. 313-331
• Pondělíček, Bedřich: Note on homomorphisms of direct products of algebras. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 3, pp. 500-501
• Mlček, Josef: Valuations of structures. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 4, pp. 681-695
• Pálfy, Péter Pál: On certain congruence lattices of finite unary algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 1, pp. 89-95
• Vinárek, Jiří: Remarks on subdirect representations in categories. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 1, pp. 63-70
• Chajda, Ivan: Two constructions of compatible relations. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 3, pp. 439-444
• Ševečková, Jitka: Compact elements of the lattice of congruences in an algebra. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 304-311
• Duda, Jaromír; Chajda, Ivan: Ideals of binary relational systems. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 280-291
• Chvalina, Jan: Isomorphic algebraic pre-closures and equivalent set-systems. (English). Archivum Mathematicum, vol. 13 (1977), issue 3, pp. 141-147
• Chajda, Ivan: Lattices of compatible relations. (English). Archivum Mathematicum, vol. 13 (1977), issue 2, pp. 89-95
• Chajda, Ivan; Zelinka, Bohdan: Permutable tolerances. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 217-220
• Nieminen, Juhani: Tolerance relations on complete lattices. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 18 (1977), issue 4, pp. 639-645
• Nieminen, Juhani: Tolerance relations on simple ternary algebras. (English). Archivum Mathematicum, vol. 13 (1977), issue 2, pp. 105-109
• Chajda, Ivan: Weak homomorphisms of systems of equations. (English). Archivum Mathematicum, vol. 13 (1977), issue 3, pp. 135-140
• 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
• Chajda, Ivan: Direct products of weak homomorphisms. (English). Archivum Mathematicum, vol. 12 (1976), issue 3, pp. 143-151
• Kopeček, Oldřich: Homomorphisms of partial unary algebras. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 1, pp. 108-127
• Chajda, Ivan; Niederle, Josef; Zelinka, Bohdan: On existence conditions for compatible tolerances. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 304-311
• Trnková, Věra: On products of binary relational structures. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 17 (1976), issue 3, pp. 513-521
• Chajda, Ivan: On the unique factorization problem. (English). Mathematica Slovaca, vol. 26 (1976), issue 3, pp. 201-205
• Sekanina, Milan: Graphs and Betweeness. (English). Matematický časopis, vol. 25 (1975), issue 1, pp. 41-47
• Zelinka, Bohdan: Intersection Graphs of Set Families Closed under Intersection and Satisfying the Descending Chain Condition. (English). Matematický časopis, vol. 25 (1975), issue 3, pp. 193-205
• Chajda, Ivan: Systems of equations and tolerance relations. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 2, pp. 302-308
• Zelinka, Bohdan: Tolerance in algebraic structures. II. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 2, pp. 175-178
• Zelinka, Bohdan: Tolerances and congruences on tree algebras. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 4, pp. 634-637
• Kolibiar, Milan; Marcisová, Tamara: On a Question of J. Hashimoto. (English). Matematický časopis, vol. 24 (1974), issue 2, pp. 179-185
• Kopeček, Oldřich; Novotný, Miroslav: On some invariants of unary algebras. (English). Czechoslovak Mathematical Journal, vol. 24 (1974), issue 2, pp. 219-246
• Tran Duc Mai: Partitions and congruences in algebras. I. Basic properties. (English). Archivum Mathematicum, vol. 10 (1974), issue 2, pp. 111-122
• Tran Duc Mai: Partitions and congruences in algebras. II. Modular and distributive equalities, complements. (English). Archivum Mathematicum, vol. 10 (1974), issue 3, pp. 159-172
• Tran Duc Mai: Partitions and congruences in algebras. III. Commutativity of congruences. (English). Archivum Mathematicum, vol. 10 (1974), issue 3, pp. 173-187
• Tran Duc Mai: Partitions and congruences in algebras. IV. Associable systems. (English). Archivum Mathematicum, vol. 10 (1974), issue 4, pp. 231-253
• Abrhan, Imrich: О максимальных подалгебрах в унарных алгебрах. (Russian) [Maximal Subalgebras in Unary Algebras]. Matematický časopis, vol. 24 (1974), issue 2, pp. 113-128
• Schwarz, Štefan: Суммы степеней бинарных отношений. (Russian) [Sums of Powers of Binary Relations]. Matematický časopis, vol. 24 (1974), issue 2, pp. 161-171
• Žembery, Ivan: Характеризация операний в алгебрах при помощи частично упорядоченных множеств. (Russian) [Characterization of Operations in Algebras by Means of Partially Ordered Sets]. Matematický časopis, vol. 24 (1974), issue 3, pp. 277-281
• Žembery, Ivan: Chains of Decompositions and $n$-Ary Relations. (English). Matematický časopis, vol. 23 (1973), issue 4, pp. 297-300
• Draškovičová, Hilda: Independence of Equational Classes. (English). Matematický časopis, vol. 23 (1973), issue 2, pp. 125-135
• Draškovičová, Hilda: Permutability, Distributivity of Equivalence Relations and Direct Products. (English). Matematický časopis, vol. 23 (1973), issue 1, pp. 69-87
• Ježek, J.: Algebraicity of endomorphisms of some relational structures. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 13 (1972), issue 2, pp. 43-52
• Čulík, Karel: Algorithmization of algebras and relational structures. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 3, pp. 457-477
• Draškovičová, Hilda: On a Generalization of Permutable Equivalence Relations. (English). Matematický časopis, vol. 22 (1972), issue 4, pp. 297-309
• Beran, L.; Ježek, J.: On embedding of lattices in simple lattices. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 13 (1972), issue 1, pp. 87-89
• Křivka, Pavel: On representations of monoids as monoids of polynomials. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 13 (1972), issue 1, pp. 121-136
• Nešetřil, Jaroslav: Every group is a maximal subgroup of the semigroup of relations. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 1, pp. 19-21
• Grimeisen, G.: On the saturation of a topological partial algebra with respect to a congruence relation. (English). In: Novák, J. (ed.): General Topology and its Relations to Modern Analysis and Algebra. Proceedings of the Third Prague Topological Symposium, 1971. Academia Publishing House of the Czechoslovak Academy of Sciences, Praha, 1972. pp. 151-153
• Hanák, Jan: Simultaneous nondeterministic games. III. (English). Archivum Mathematicum, vol. 7 (1971), issue 3, pp. 123-144
• Rosenberg, Ivo: Double lexicographic products. (English). Archivum Mathematicum, vol. 6 (1970), issue 4, pp. 221-228
• Rosenberg, Ivo: The refinement of two isomorphic generalized lexicographic products. (English). Archivum Mathematicum, vol. 6 (1970), issue 4, pp. 229-235
• Hanák, Jan: Simultaneous nondeterministic games. II. (English). Archivum Mathematicum, vol. 6 (1970), issue 2, pp. 115-144
• Salii, V. N.: Полугруппы случайных отношений. (Russian) [Semigroups of Random Relations]. Matematický časopis, vol. 20 (1970), issue 2, pp. 122-134
• Mendelsohn, E.: An elementary characterization of the category of relational systems. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 10 (1969), issue 4, pp. 571-588
• Novotný, Miroslav: On Cartesian products. (English). Archivum Mathematicum, vol. 5 (1969), issue 2, pp. 101-110
• Hanák, Jan: Simultaneous nondeterministic games. I. (English). Archivum Mathematicum, vol. 5 (1969), issue 1, pp. 29-60
• Sedláček, Ladislav: Užití zobecněné věty Jordan-Hölderovy v teorii direktních součinů množin s operátory. (Czech) [An application of the generalized Jordan-Hölder theorem in the theory of direct products of sets with operators]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 7 (1966), issue 1, pp. 45-57