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Author: Chajda, Ivan

• Chajda, Ivan; Länger, Helmut: Monotone and cone preserving mappings on posets. (English). Mathematica Bohemica, vol. 148 (2023), issue 2, pp. 197-210
• Chajda, Ivan; Länger, Helmut: Orthogonality and complementation in the lattice of subspaces of a finite vector space. (English). Mathematica Bohemica, vol. 147 (2022), issue 2, pp. 141-153
• Chajda, Ivan; Länger, Helmut: Residuation in twist products and pseudo-Kleene posets. (English). Mathematica Bohemica, vol. 147 (2022), issue 3, pp. 369-383
• Chajda, Ivan; Länger, Helmut: Orthomodular lattices that are horizontal sums of Boolean algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 61 (2020), issue 1, pp. 11-20
• Chajda, Ivan; Länger, Helmut: Relatively pseudocomplemented posets. (English). Mathematica Bohemica, vol. 143 (2018), issue 1, pp. 89-97
• Chajda, Ivan; Länger, Helmut: States on basic algebras. (English). Mathematica Bohemica, vol. 142 (2017), issue 2, pp. 197-210
• Chajda, Ivan: A Note on Pseudo-Kleene Algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 55 (2016), issue 1, pp. 39-45
• Chajda, Ivan; Länger, Helmut: An ordered structure of pseudo-BCI-algebras. (English). Mathematica Bohemica, vol. 141 (2016), issue 1, pp. 91-98
• Chajda, Ivan; Länger, Helmut; Švrček, Filip: Multiplicatively idempotent semirings. (English). Mathematica Bohemica, vol. 140 (2015), issue 1, pp. 35-42
• Chajda, Ivan; Ledda, Antonio; Paoli, Francesco: Compatible Idempotent Terms in Universal Algebra. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 53 (2014), issue 2, pp. 35-51
• Chajda, Ivan; Länger, Helmut: Orthomodular Posets Can Be Organized as Conditionally Residuated Structures. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 53 (2014), issue 2, pp. 29-33
• Chajda, Ivan: The Role of Halaš Identity in Orthomodular Lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 53 (2014), issue 1, pp. 19-24
• Chajda, Ivan; Länger, Helmut: Groupoids assigned to relational systems. (English). Mathematica Bohemica, vol. 138 (2013), issue 1, pp. 15-23
• Chajda, Ivan; Švrček, Filip: The Rings Which Can Be Recovered by Means of the Difference. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 52 (2013), issue 1, pp. 49-55
• Chajda, Ivan: Pseudocomplemented and Stone Posets. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 51 (2012), issue 1, pp. 29-34
• Chajda, Ivan; Kolařík, Miroslav; Švrček, Filip: Properties of relatively pseudocomplemented directoids. (English). Mathematica Bohemica, vol. 136 (2011), issue 1, pp. 9-23
• Chajda, Ivan; Kolařík, Miroslav; Švrček, Filip: Implication and equivalential reducts of basic algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 49 (2010), issue 2, pp. 21-36
• Chajda, Ivan; Länger, Helmut: Quotients and homomorphisms of relational systems. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 49 (2010), issue 2, pp. 37-47
• Chajda, Ivan; Kolařík, Miroslav: Basic pseudorings. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 48 (2009), issue 1, pp. 25-31
• Chajda, Ivan: A characterization of commutative basic algebras. (English). Mathematica Bohemica, vol. 134 (2009), issue 2, pp. 113-120
• Chajda, Ivan: Conjugated algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 48 (2009), issue 1, pp. 17-23
• Chajda, Ivan: Relatively pseudocomplemented directoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 50 (2009), issue 3, pp. 349-357
• Chajda, Ivan: The axioms for implication in orthologic. (English). Czechoslovak Mathematical Journal, vol. 58 (2008), issue 1, pp. 15-21
• Chajda, Ivan: Discriminator order algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 47 (2008), issue 1, pp. 23-25
• Chajda, Ivan; Kühr, Jan: Join-semilattices whose sections are residuated po-monoids. (English). Czechoslovak Mathematical Journal, vol. 58 (2008), issue 4, pp. 1107-1127
• Chajda, Ivan; Kolařík, Miroslav: Monadic basic algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 47 (2008), issue 1, pp. 27-36
• Chajda, Ivan: Pseudocomplemented directoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 49 (2008), issue 4, pp. 533-539
• Chajda, Ivan; Kolařík, Miroslav: Ideals, congruences and annihilators on nearlattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 46 (2007), issue 1, pp. 25-33
• Chajda, Ivan; Kühr, Jan: A non-associative generalization of MV-algebras. (English). Mathematica Slovaca, vol. 57 (2007), issue 4, pp. [301]-312
• Chajda, Ivan: Ring-like structures derived from $\lambda $-lattices with antitone involutions. (English). Mathematica Bohemica, vol. 132 (2007), issue 1, pp. 87-96
• Chajda, Ivan; Halaš, Radomír: Varieties satisfying the triangular scheme need not be congruence distributive. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 46 (2007), issue 1, pp. 19-24
• Chajda, Ivan; Kolařík, Miroslav: A decomposition of homomorphic images of nearlattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 45 (2006), issue 1, pp. 43-51
• Chajda, Ivan: Directoids with sectionally switching involutions. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 45 (2006), issue 1, pp. 35-41
• Chajda, Ivan; Kühr, Jan: GMV-algebras and meet-semilattices with sectionally antitone permutations. (English). Mathematica Slovaca, vol. 56 (2006), issue 3, pp. 275-288
• Chajda, Ivan; Kühr, Jan: A note on interval $MV$-algebras. (English). Mathematica Slovaca, vol. 56 (2006), issue 1, pp. 47-52
• Chajda, Ivan: A groupoid characterization of orthomodular lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 44 (2005), issue 1, pp. 13-18
• 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
• Chajda, Ivan: Sheffer operation in ortholattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 44 (2005), issue 1, pp. 19-23
• Chajda, Ivan: Class preserving mappings of equivalence systems. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 43 (2004), issue 1, pp. 61-64
• Chajda, Ivan; Hošková, Šárka: A factorization of quasiorder hypergroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 45 (2004), issue 4, pp. 573-581
• Chajda, Ivan; Dorfer, Gerhard; Länger, Helmut: Local versions of some congruence properties in single algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 43 (2004), issue 1, pp. 65-73
• Chajda, Ivan; Länger, Helmut; Mączyński, Maciej: Ring-like structures corresponding to generalized orthomodular lattices. (English). Mathematica Slovaca, vol. 54 (2004), issue 2, pp. 143-150
• Chajda, Ivan; Zedník, Josef: Distributivity and modularity of lattices of quasiorders. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 42 (2003), issue 1, pp. 13-18
• Chajda, Ivan: Generalized deductive systems in subregular varieties. (English). Mathematica Bohemica, vol. 128 (2003), issue 3, pp. 319-324
• Chajda, Ivan: Lattices and semilattices having an antitone involution in every upper interval. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 44 (2003), issue 4, pp. 577-585
• Chajda, Ivan; Czédli, Gábor; Horváth, Eszter K.: Trapezoid lemma and congruence distributivity. (English). Mathematica Slovaca, vol. 53 (2003), issue 3, pp. 247-253
• Chajda, Ivan; Halaš, Radomír: Algebraic properties of pre-logics. (English). Mathematica Slovaca, vol. 52 (2002), issue 2, pp. 157-175
• Chajda, Ivan: A characterization of congruence kernels in pseudocomplemented semilattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 41 (2002), issue 1, pp. 35-37
• Chajda, Ivan; Länger, Helmut: A note on normal varieties of monounary algebras. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 2, pp. 369-373
• Chajda, Ivan: Semiregularity of congruences implies congruence modularity at 0. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 2, pp. 333-336
• Chajda, Ivan; Rachůnek, Jiří: Annihilators in normal autometrized algebras. (English). Czechoslovak Mathematical Journal, vol. 51 (2001), issue 1, pp. 111-120
• Chajda, Ivan: A common generalization of permutability and 0-permutability. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 40 (2001), issue 1, pp. 23-29
• Chajda, Ivan; Länger, Helmut: A simple basis of ideal terms of Brouwerian semilattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 40 (2001), issue 1, pp. 37-42
• Chajda, Ivan: Varieties which are locally regular and permutable at 0. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 40 (2001), issue 1, pp. 31-35
• Chajda, Ivan: Characterizing binary discriminator algebras. (English). Mathematica Bohemica, vol. 125 (2000), issue 4, pp. 497-504
• Chajda, Ivan; Halaš, Radomír: Characterizing triplets for modular pseudocomplemented ordered sets. (English). Mathematica Slovaca, vol. 50 (2000), issue 5, pp. 513-524
• Chajda, Ivan: A note on congruence kernels in ortholattices. (English). Mathematica Bohemica, vol. 125 (2000), issue 2, pp. 169-172
• Chajda, Ivan: Uniformity of congruences in coherent varieties. (English). Mathematica Bohemica, vol. 125 (2000), issue 3, pp. 269-273
• 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, Ivan: Algebras satisfying certain quasiorder identities. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 38 (1999), issue 1, pp. 35-41
• Chajda, Ivan: Locally coherent algebras. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 38 (1999), issue 1, pp. 43-48
• Chajda, Ivan; Snášel, Václav: Congruences in ordered sets. (English). Mathematica Bohemica, vol. 123 (1998), issue 1, pp. 95-100
• 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
• Chajda, Ivan; Duda, Jaromír: Compact universal relation in varieties with constants. (English). Czechoslovak Mathematical Journal, vol. 47 (1997), issue 1, pp. 173-178
• Chajda, Ivan; Halaš, Radomír; Machala, František: Congruences and ideals in ternary rings. (English). Czechoslovak Mathematical Journal, vol. 47 (1997), issue 1, pp. 163-172
• Chajda, Ivan: The degrees of regularity in varieties. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 36 (1997), issue 1, pp. 27-31
• Chajda, Ivan: Jónsson's lemma for normally presented varieties. (English). Mathematica Bohemica, vol. 122 (1997), issue 4, pp. 381-382
• Bělohlávek, Radim; Chajda, Ivan: Polynomially determined congruences in algebras without constants. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 36 (1997), issue 1, pp. 7-14
• Chajda, Ivan: Rees ideal algebras. (English). Mathematica Bohemica, vol. 122 (1997), issue 2, pp. 125-130
• Chajda, Ivan: Congruence semimodularity of conservative groupoids. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 35 (1996), issue 1, pp. 43-45
• Chajda, Ivan; Czédli, Gábor: Four notes on quasiorder lattices. (English). Mathematica Slovaca, vol. 46 (1996), issue 4, pp. 371-378
• Chajda, Ivan: Pseudosemirings induced by ortholattices. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 3, pp. 405-411
• Chajda, Ivan: Regularity and permutability via transferability of tolerances. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 35 (1996), issue 1, pp. 39-42
• Chajda, Ivan; Emanovský, Petr: $\Sigma$-Hamiltonian and $\Sigma$-regular algebraic structures. (English). Mathematica Bohemica, vol. 121 (1996), issue 2, pp. 177-182
• Chajda, Ivan: Tolerances on $q$-lattices. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 1, pp. 21-28
• Chajda, Ivan: The Csákány theory of regularity for finite algebras. (English). Mathematica Slovaca, vol. 45 (1995), issue 1, pp. 39-43
• Chajda, Ivan: Indexed annihilators in lattices. (English). Archivum Mathematicum, vol. 31 (1995), issue 4, pp. 259-262
• Halaš, Radomír; Chajda, Ivan: Indexed annihilators in ordered sets. (English). Mathematica Slovaca, vol. 45 (1995), issue 5, pp. 501-508
• 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: Semilattices of finite arithmetical algebras. (English). Czechoslovak Mathematical Journal, vol. 45 (1995), issue 4, pp. 659-662
• Chajda, Ivan; Emanovský, Petr: $\Sigma$-isomorphic algebraic structures. (English). Mathematica Bohemica, vol. 120 (1995), issue 1, pp. 71-81
• Chajda, Ivan: Some modifications of the congruence extension property. (English). Mathematica Slovaca, vol. 45 (1995), issue 3, pp. 251-254
• Chajda, Ivan: Tolerance lattice of algebras with restricted similarity type. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 34 (1995), issue 1, pp. 59-62
• Chajda, Ivan: Varieties having the congruence extension property. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 34 (1995), issue 1, pp. 63-68
• Chajda, Ivan: An algebra of quasiordered logic. (English). Mathematica Bohemica, vol. 119 (1994), issue 2, pp. 129-135
• Chajda, Ivan: Algebras with $n$-transferable tolerances. (English). Mathematica Bohemica, vol. 119 (1994), issue 2, pp. 137-142
• Chajda, Ivan: A characterization of arithmetical varieties by two-element subsets. (English). Czechoslovak Mathematical Journal, vol. 44 (1994), issue 3, pp. 521-522
• Chajda, Ivan: Characterizing tolerance trivial finite algebras. (English). Archivum Mathematicum, vol. 30 (1994), issue 3, pp. 165-169
• 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
• Chajda, Ivan: Principal tolerances on lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 17-22
• Chajda, Ivan: Regular lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 32 (1993), issue 1, pp. 17-20
• 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
• Chajda, Ivan: Characterizations of Hamiltonian algebras. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 3, pp. 487-489
• Chajda, Ivan: Complemented ordered sets. (English). Archivum Mathematicum, vol. 28 (1992), issue 1, pp. 25-34
• Chajda, Ivan: Lattices in quasiordered sets. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 31 (1992), issue 1, pp. 6-12
• Chajda, Ivan: A note on varieties with distributive subalgebra lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 31 (1992), issue 1, pp. 25-28
• Chajda, Ivan: Varieties with modular and distributive lattices of symmetric or reflexive relations. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 4, pp. 623-630
• Chajda, Ivan: Every at most four element algebra has a Mal'cev theory for permutability. (English). Mathematica Slovaca, vol. 41 (1991), issue 1, pp. 35-39
• Chajda, Ivan; Haviar, Miroslav: Induced pseudoorders. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 30 (1991), issue 1, pp. 9-16
• Chajda, Ivan: Permutability of congruences in varieties with idempotent operations. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 30 (1991), issue 1, pp. 33-37
• Chajda, Ivan: Varieties having distributive lattices of quasiorders. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 1, pp. 85-89
• Chajda, Ivan: Weak coherence of congruences. (English). Czechoslovak Mathematical Journal, vol. 41 (1991), issue 1, pp. 149-154
• Chajda, Ivan: A note on permutability in varieties. (English). Časopis pro pěstování matematiky, vol. 115 (1990), issue 1, pp. 85-91
• Chajda, Ivan: On the existence of non-trivial tolerances in permutable algebras. (English). Czechoslovak Mathematical Journal, vol. 40 (1990), issue 4, pp. 598-600
• Chajda, Ivan: A principal congruence identity characterizing the variety of distributive lattices with zero. (English). Mathematica Slovaca, vol. 40 (1990), issue 2, pp. 129-131
• Chajda, Ivan: Quasicomplemented semilattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 29 (1990), issue 1, pp. 11-22
• Chajda, Ivan: Weak homomorphisms in implication algebra. (English). Časopis pro pěstování matematiky, vol. 115 (1990), issue 1, pp. 61-63
• Chajda, Ivan; Pondělíček, Bedřich: Algebras with tolerance extension property in 0. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 1, pp. 142-146
• Chajda, Ivan: On Grätzer's problem of binary 1-step congruence schemes. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 3, pp. 470-476
• Chajda, Ivan: Principal tolerances on lattices. (English). Czechoslovak Mathematical Journal, vol. 39 (1989), issue 1, pp. 176-180
• Chajda, Ivan; Duda, Jaromír: Varieties satisfying ideal equalities. (English). Mathematica Slovaca, vol. 39 (1989), issue 1, pp. 55-63
• Chajda, Ivan: Algebras whose principal congruences form a sublattice of the congruence lattice. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 4, pp. 585-588
• Chajda, Ivan: The egg-box property of congruences. (English). Mathematica Slovaca, vol. 38 (1988), issue 3, pp. 243-247
• Chajda, Ivan; Zelinka, Bohdan: Tolerances and congruences on implication algebras. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 2, pp. 207-217
• Chajda, Ivan: Tolerances in congruence permutable algebras. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 2, pp. 218-225
• Chajda, Ivan: Algebras with principal tolerances. (English). Mathematica Slovaca, vol. 37 (1987), issue 2, pp. 169-172
• Chajda, Ivan; Zelinka, Bohdan: A characterization of tolerance-distributive tree semilattices. (English). Czechoslovak Mathematical Journal, vol. 37 (1987), issue 2, pp. 175-180
• Chajda, Ivan: Directly decomposable congruences in varieties with nullary operations. (English). Mathematica Slovaca, vol. 37 (1987), issue 1, pp. 31-35
• Chajda, Ivan: On the one principal congruence identity. (English). Archivum Mathematicum, vol. 23 (1987), issue 4, pp. 187-190
• Chajda, Ivan: Congruence distributivity in varieties with constants. (English). Archivum Mathematicum, vol. 22 (1986), issue 3, pp. 121-124
• Chajda, Ivan: Weakly regular algebras in varieties with principal compact congruences. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 1, pp. 140-146
• Chajda, Ivan: Coherence in dual discriminator varieties. (English). Mathematica Slovaca, vol. 35 (1985), issue 2, pp. 155-159
• Chajda, Ivan; Novák, Vítězslav: On extensions of cyclic orders. (English). Časopis pro pěstování matematiky, vol. 110 (1985), issue 2, pp. 116-121
• Chajda, Ivan: Varieties with tolerance and congruence extension property. (English). Archivum Mathematicum, vol. 21 (1985), issue 1, pp. 5-12
• Chajda, Ivan: Weakly regular lattices. (English). Mathematica Slovaca, vol. 35 (1985), issue 4, pp. 387-391
• Chajda, Ivan; Zelinka, Bohdan: Complemented tolerances on lattices. (English). Časopis pro pěstování matematiky, vol. 109 (1984), issue 1, pp. 54-59
• Chajda, Ivan: Regularity in arithmetical varieties. (English). Archivum Mathematicum, vol. 20 (1984), issue 4, pp. 177-182
• Chajda, Ivan: Transferable principal congruences and regular algebras. (English). Mathematica Slovaca, vol. 34 (1984), issue 1, pp. 97-102
• Chajda, Ivan; Zelinka, Bohdan: Directly decomposable tolerances on direct products of lattices and semilattices. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 4, pp. 519-521
• Chajda, Ivan; Rachůnek, Jiří: Relational characterizations of permutable and $n$-permutable varieties. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 4, pp. 505-508
• Chajda, Ivan; Nieminen, Juhani; Zelinka, Bohdan: Tolerances and orderings on semilattices. (English). Archivum Mathematicum, vol. 19 (1983), issue 3, pp. 125-131
• Chajda, Ivan: Direct decomposability of congruences in congruence-permutable varieties. (English). Mathematica Slovaca, vol. 32 (1982), issue 1, pp. 93-96
• Chajda, Ivan; Nieminen, Juhani: Direct decomposability of tolerances on lattices, semilattices and quasilattices. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 1, pp. 110-115
• Chajda, Ivan; Duda, Jaromír: Finitely generated relations and their applications to permutable and $n$-permutable varieties. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 23 (1982), issue 1, pp. 41-54
• Chajda, Ivan: A note on functionally complete algebras. (English). Archivum Mathematicum, vol. 17 (1981), issue 3, pp. 139-140
• Chajda, Ivan; Nieminen, Juhani: Atomicity of tolerance lattices. (English). Czechoslovak Mathematical Journal, vol. 30 (1980), issue 4, pp. 606-609
• Chajda, Ivan; Dalík, Josef; Niederle, Josef; Veselý, Vítězslav; Zelinka, Bohdan: How to draw tolerance lattices of finite chains. (English). Archivum Mathematicum, vol. 16 (1980), issue 3, pp. 161-165
• Chajda, Ivan: Polynomially determined tolerances. (English). Czechoslovak Mathematical Journal, vol. 30 (1980), issue 3, pp. 470-473,474
• Chajda, Ivan: Relational classes and their characterizations. (English). Archivum Mathematicum, vol. 16 (1980), issue 4, pp. 199-203
• Chajda, Ivan: Tolerances and the Chinese remainder theorem. (English). Mathematica Slovaca, vol. 30 (1980), issue 4, pp. 369-371
• Chajda, Ivan: A characterization of distributive lattices by tolerance lattices. (English). Archivum Mathematicum, vol. 15 (1979), issue 4, pp. 203-204
• Chajda, Ivan: Decompositions of homomorphisms. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 4, pp. 568-572
• Chajda, Ivan; Zelinka, Bohdan: Tolerances and convexity. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 4, pp. 584-587
• Chajda, Ivan: Congruence factorizations on distributive lattices. (English). Mathematica Slovaca, vol. 28 (1978), issue 4, pp. 343-347
• Chajda, Ivan: Homomorphisms of direct products of algebras. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 1, pp. 155-170
• Chajda, Ivan; Zelinka, Bohdan: Metrics and tolerances. (English). Archivum Mathematicum, vol. 14 (1978), issue 4, pp. 193-200
• Chajda, Ivan: Notes on lattice congruences. (English). Časopis pro pěstování matematiky, vol. 103 (1978), issue 3, pp. 255-258
• Chajda, Ivan: On the tolerance extension property. (English). Časopis pro pěstování matematiky, vol. 103 (1978), issue 4, pp. 327-332
• Chajda, Ivan: Two constructions of compatible relations. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 3, pp. 439-444
• Duda, Jaromír; Chajda, Ivan: Ideals of binary relational systems. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 280-291
• Chajda, Ivan; Niederle, Josef: Ideals of weakly associative lattices and pseudo-ordered sets. (English). Archivum Mathematicum, vol. 13 (1977), issue 4, pp. 181-186
• Chajda, Ivan: Lattices of compatible relations. (English). Archivum Mathematicum, vol. 13 (1977), issue 2, pp. 89-95
• Chajda, Ivan; Zelinka, Bohdan: Lattices of tolerances. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 1, pp. 10-24
• Chajda, Ivan; Zelinka, Bohdan: Minimal compatible tolerances on lattices. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 3, pp. 452-459
• Chajda, Ivan; Zelinka, Bohdan: Permutable tolerances. (English). Časopis pro pěstování matematiky, vol. 102 (1977), issue 3, pp. 217-220
• Chajda, Ivan: Weak homomorphisms of systems of equations. (English). Archivum Mathematicum, vol. 13 (1977), issue 3, pp. 135-140
• Chajda, Ivan: A construction of tolerances on modular lattices. (English). Časopis pro pěstování matematiky, vol. 101 (1976), issue 2, pp. 195-198
• Chajda, Ivan: Direct products of weak homomorphisms. (English). Archivum Mathematicum, vol. 12 (1976), issue 3, pp. 143-151
• Chajda, Ivan; Niederle, Josef; Zelinka, Bohdan: On existence conditions for compatible tolerances. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 304-311
• Chajda, Ivan: On the unique factorization problem. (English). Mathematica Slovaca, vol. 26 (1976), issue 3, pp. 201-205
• Chajda, Ivan; Zelinka, Bohdan: Weakly associative lattices and tolerance relations. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 259-269
• Chajda, Ivan; Zelinka, Bohdan: Compatible relations on algebras. (English). Časopis pro pěstování matematiky, vol. 100 (1975), issue 4, pp. 355-360
• Chajda, Ivan: Matrices of homomorphic mappings. (English). Archivum Mathematicum, vol. 11 (1975), issue 3, pp. 123-130
• Chajda, Ivan: Systems of equations and tolerance relations. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 2, pp. 302-308
• Chajda, Ivan: Direct products of homomorphic mappings. II. (English). Archivum Mathematicum, vol. 10 (1974), issue 1, pp. 1-8
• Chajda, Ivan: Ideals of $n$-algebras. (English). Archivum Mathematicum, vol. 10 (1974), issue 3, pp. 189-194
• Chajda, Ivan; Zelinka, Bohdan: Tolerance relation on lattices. (English). Časopis pro pěstování matematiky, vol. 99 (1974), issue 4, pp. 394-399
• Chajda, Ivan: Direct products of homomorphic mappings. I. (English). Archivum Mathematicum, vol. 9 (1973), issue 2, pp. 61-65
• Chajda, Ivan: Extensions of mappings of finite Boolean algebras to homomorphisms. (English). Archivum Mathematicum, vol. 9 (1973), issue 1, pp. 22-25
• Chajda, Ivan: On substitution of operations in systems of equations over algebras. (English). Archivum Mathematicum, vol. 9 (1973), issue 3, pp. 135-139
• Chajda, Ivan: Systems of equations over finite Boolean algebras. (English). Archivum Mathematicum, vol. 9 (1973), issue 4, pp. 171-181
• Chajda, Ivan: Matrix representation of homomorphic mappings of finite Boolean algebras. (English). Archivum Mathematicum, vol. 8 (1972), issue 3, pp. 143-148