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20M10 General structure theory (166 articles)

• Nagy, Attila; Tóth, Csaba: On a probabilistic problem on finite semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 64 (2023), issue 4, pp. 395-410
• Nagy, Attila; Tóth, Csaba: On special Rees matrix semigroups over semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 64 (2023), issue 3, pp. 279-288
• Nagy, Attila; Tóth, Csaba: On the probability that two elements of a finite semigroup have the same right matrix. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 63 (2022), issue 1, pp. 21-31
• Petrich, Mario: Bases for certain varieties of completely regular semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 62 (2021), issue 1, pp. 41-65
• Abdelmoumen, Boulbeba; Jedidi, Omar; Jeribi, Aref: Time asymptotic description of an abstract Cauchy problem solution and application to transport equation. (English). Applications of Mathematics, vol. 59 (2014), issue 1, pp. 53-67
• Petrich, Mario: Normal cryptogroups with an associate subgroup. (English). Czechoslovak Mathematical Journal, vol. 63 (2013), issue 2, pp. 289-305
• 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
• Abdullahu, Fitore; Zejnullahu, Abdullah: Notes on semimedial semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 50 (2009), issue 3, pp. 321-324
• Cegarra, Antonio M.; Petrich, Mario: The rank of a commutative semigroup. (English). Mathematica Bohemica, vol. 134 (2009), issue 3, pp. 301-318
• Chen, Wei; Zhao, Xianzhong: The structure of idempotent residuated chains. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 2, pp. 453-479
• Descalço, L.; Ruškuc, N.: Properties of the subsemigroups of the bicyclic monoid. (English). Czechoslovak Mathematical Journal, vol. 58 (2008), issue 2, pp. 311-330
• Fattahi, Abdolmajid; Vishki, H. R. Ebrahimi: Characterization of $E\mathcal{F}$-subcompactification. (English). Archivum Mathematicum, vol. 42 (2006), issue 3, pp. 247-250
• He, Yong; Shao, Fang; Li, Shi-qun; Gao, Wei: On left $C$-$\scr U$-liberal semigroups. (English). Czechoslovak Mathematical Journal, vol. 56 (2006), issue 4, pp. 1085-1108
• Petrich, Mario: On sandwich sets and congruences on regular semigroups. (English). Czechoslovak Mathematical Journal, vol. 56 (2006), issue 1, pp. 27-46
• Ježek, Jaroslav; Kepka, Tomáš: Selfdistributive groupoids. Part D1: Left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 47 (2006), issue 1, pp. 15-56
• Giraldes, E.; Marques-Smith, P.; Mitsch, H.: Generalized $F$-semigroups. (English). Mathematica Bohemica, vol. 130 (2005), issue 2, pp. 203-220
• Ayik, Hayrullah: On finiteness conditions for Rees matrix semigroups. (English). Czechoslovak Mathematical Journal, vol. 55 (2005), issue 2, pp. 455-463
• 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
• Shum, K. P.; Ren, X. M.: On super hamiltonian semigroups. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 1, pp. 247-252
• 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
• Zelinka, Bohdan: Algebraic approach to locally finite trees with one end. (English). Mathematica Bohemica, vol. 128 (2003), issue 1, pp. 37-44
• Thron, R.; Koppitz, J.: Lattice-theoretically characterized classes of finite bands. (English). Archivum Mathematicum, vol. 39 (2003), issue 1, pp. 1-10
• Drewniak, Jósef; Sobera, Jolanta: Structure of partially ordered cyclic semigroups. (English). Czechoslovak Mathematical Journal, vol. 53 (2003), issue 4, pp. 777-791
• Petrich, Mario: Certain partial orders on semigroups. (English). Czechoslovak Mathematical Journal, vol. 51 (2001), issue 2, pp. 415-432
• Pastijn, F.; Zhao, Xianzhong: Green's $\mathcal{D}$-relation for the multiplicative reduct of an idempotent semiring. (English). Archivum Mathematicum, vol. 36 (2000), issue 2, pp. 77-93
• Pondělíček, Bedřich: Chordal intersection graphs of bands. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 2, pp. 225-232
• Bogdanović, Stojan; Ćirić, Miroslav: Radicals of Green’s relations. (English). Czechoslovak Mathematical Journal, vol. 49 (1999), issue 4, pp. 683-688
• Dumesnil, Jill A.: On $m$-semigroups. (English). Czechoslovak Mathematical Journal, vol. 47 (1997), issue 1, pp. 33-45
• Abrhan, Imrich: On minimal ideals in semigroups with respect to their subsets. I. (English). Mathematica Bohemica, vol. 122 (1997), issue 1, pp. 1-12
• Magill, K. D., Jr.: The largest proper regular ideal of $S(X)$. (English). Czechoslovak Mathematical Journal, vol. 46 (1996), issue 1, pp. 73-82
• Zelinka, Bohdan: Subtraction semigroups. (English). Mathematica Bohemica, vol. 120 (1995), issue 4, pp. 445-447
• Fabrici, Imrich: $\cal J$-classes in the direct product of two semigroups. (English). Czechoslovak Mathematical Journal, vol. 44 (1994), issue 2, pp. 325-335
• Pondělíček, Bedřich: On generalized conditionally commutative semigroups. (English). Mathematica Slovaca, vol. 44 (1994), issue 3, pp. 359-364
• Abrhan, Imrich: On minimal ideals in semigroups with respect to their subsets. II. (English). Mathematica Slovaca, vol. 44 (1994), issue 4, pp. 463-478
• Mitsch, Heinz: Semigroups and their natural order. (English). Mathematica Slovaca, vol. 44 (1994), issue 4, pp. 445-462
• Kim, K. H.; Roush, F. W.: Strong shift equivalence in semigroups. (English). Mathematica Slovaca, vol. 44 (1994), issue 3, pp. 351-357
• Petrich, Mario: The translational hull of a normal cryptogroup. (English). Mathematica Slovaca, vol. 44 (1994), issue 2, pp. 245-262
• Merlier, Thérèse: On lattice ordered periodic semigroups. (English). Czechoslovak Mathematical Journal, vol. 43 (1993), issue 1, pp. 95-106
• Fabrici, Imrich: One-sided principal ideals in the direct product of two semigroups. (English). Mathematica Bohemica, vol. 118 (1993), issue 4, pp. 337-342
• Yang, Shangjun; Barker, George P.: Generalized Green's relations. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 2, pp. 211-224
• Lai, C. K.; Shum, K. P.: A note in inverse and dual semigroups. (English). Czechoslovak Mathematical Journal, vol. 42 (1992), issue 1, pp. 7-10
• Bosbach, Bruno: Hyperarchimedische Teilbarkeitshalbgruppen. (German) [Hyperarchimedian divisibility semigroups]. Czechoslovak Mathematical Journal, vol. 39 (1989), issue 3, pp. 528-543
• Howie, John M.: Embedding semigroups in nilpotent-generated semigroups. (English). Mathematica Slovaca, vol. 39 (1989), issue 1, pp. 47-54
• Kepka, T.; Zejnullahu, A.: Finitely generated left distributive semigoups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 30 (1989), issue 1, pp. 33-36
• Zejnullahu, A.: Free left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 30 (1989), issue 1, pp. 29-32
• Zejnullahu, A.: Splitting left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 30 (1989), issue 1, pp. 23-27
• Pondělíček, Bedřich: Note on the congruence lattice of a commutative separative semigroup. (English). Časopis pro pěstování matematiky, vol. 113 (1988), issue 1, pp. 74-79
• Kmeť, František: Radicals and their left ideal analogues in a semigroup. (English). Mathematica Slovaca, vol. 38 (1988), issue 2, pp. 139-145
• Merlier, Thérèse: Some properties of lattice ordered Rees matrix semigroups. (English). Czechoslovak Mathematical Journal, vol. 38 (1988), issue 4, pp. 573-577
• Kmeť, František: The greatest Archimedean ideal in a semigroup. (English). Mathematica Slovaca, vol. 37 (1987), issue 1, pp. 43-46
• Šulka, Robert: Nilpotency in semigroups and sublattices of their Booleans. (English). Mathematica Slovaca, vol. 37 (1987), issue 2, pp. 147-158
• Pondělíček, Bedřich: Note on nilpotency in semigroups. (English). Mathematica Slovaca, vol. 37 (1987), issue 2, pp. 205-208
• Anderson, Marlow: Archimedean equivalence for strictly positive lattice-ordered semigroups. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 1, pp. 18-27
• Gould, Matthew; Iskra, Joseph A.; Pálfy, Péter Pál: Embedding in globals of finite semilattices. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 1, pp. 87-92
• Loganathan, M.: On tolerance relations. (English). Czechoslovak Mathematical Journal, vol. 36 (1986), issue 4, pp. 662-667
• Galanová, Jana: Codomain of the tensor product of semigroups. (English). Mathematica Slovaca, vol. 35 (1985), issue 1, pp. 51-57
• Schwarz, Štefan: Fermat's theorem for matrices revisited. (English). Mathematica Slovaca, vol. 35 (1985), issue 4, pp. 343-347
• Sullivan, Robert P.: Half-automorphisms of transformation semigroups. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 3, pp. 415-418
• Pondělíček, Bedřich: Modularity and distributivity of tolerance lattices of commutative inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 1, pp. 146-157
• Johnston, Katherine: Non-modular congruence lattices of Rees matrix semigroups. (English). Czechoslovak Mathematical Journal, vol. 35 (1985), issue 3, pp. 429-443
• Galanová, Jana: A note on indecomposable elements in the tensor product of semigroups. (English). Mathematica Slovaca, vol. 35 (1985), issue 4, pp. 357-360
• Pondělíček, Bedřich: Note on quasi-Hamiltonian semigroups. (English). Časopis pro pěstování matematiky, vol. 110 (1985), issue 4, pp. 356-358
• Brinckmann, Joachim: Über die kleinste separative Kongruenz auf einer Halbgruppe. (German) [On the least separative congruence on a semigroup]. Czechoslovak Mathematical Journal, vol. 35 (1985), issue 2, pp. 300-311
• Strecker, Reinhard: Construction of medial semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 25 (1984), issue 4, pp. 689-697
• Kumaresan, K.: A note on idempotent separating congruences on a regular semigroup. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 2, pp. 315-318
• Kmeť, František: A note on the maximal semilattice of an R*NC-semigroup decomposition. (English). Mathematica Slovaca, vol. 34 (1984), issue 3, pp. 295-298
• Kumaresan, K.: A note on the strongly compatible tolerances on an arbitrary semigroup. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 2, pp. 319-321
• Goralčík, Pavel; Koubek, Václav: On the right action hierarchy of semigroups. (English). Mathematica Slovaca, vol. 34 (1984), issue 2, pp. 199-203
• Šulka, Robert: On three lattices that belong to every semigroup. (English). Mathematica Slovaca, vol. 34 (1984), issue 2, pp. 217-228
• Cherubini, Alessandra; Varisco, Ada: Semigroups and rings whose proper one-sided ideals are power joined. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 1, pp. 121-125
• Cherubini, Alessandra; Varisco, Ada: Semigroups whose proper subsemigroups are duo. (English). Czechoslovak Mathematical Journal, vol. 34 (1984), issue 4, pp. 630-644
• Kepka, T.: Varieties of left distributive semigroups. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 25 (1984), issue 1, pp. 3-18
• Cherubini, Alessandra; Varisco, Ada: Quasi Hamiltonian semigroups. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 1, pp. 131-140
• Andréka, Hajnal; Németi, István; Šulka, Robert: Remark on one-sided $A$-ideals of semigroups. (English). Mathematica Slovaca, vol. 33 (1983), issue 2, pp. 231-235
• Miller, Donald W.: Some aspects of Green's relations on periodic semigroups. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 4, pp. 537-544
• Magill, Kenneth D., Jr.; Misra, P. R.; Tewari, U. B.: Symons' $d$-congruence on sandwich semigroups. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 2, pp. 221-236
• Gould, Matthew; Richardson, Raymond E.: Translational hulls of polynomially related semigroups. (English). Czechoslovak Mathematical Journal, vol. 33 (1983), issue 1, pp. 95-100
• Masat, Francis E.: Idempotents and inverses in conventional semigroups. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 3, pp. 384-388
• Nagy, Attila: The least separative congruence on a weakly commutative semigroup. (English). Czechoslovak Mathematical Journal, vol. 32 (1982), issue 4, pp. 630-632
• Kmeť, František: Quasicommutative weakly primary semigroups. (English). Mathematica Slovaca, vol. 32 (1982), issue 4, pp. 435-440
• 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
• Masat, Francis E.: Congruences on conventional semigroups. (English). Czechoslovak Mathematical Journal, vol. 31 (1981), issue 2, pp. 199-205
• Jones, Peter R.: Inverse semigroups determined by their lattices of inverse subsemigroups. (English). Czechoslovak Mathematical Journal, vol. 31 (1981), issue 1, pp. 24-47
• Skula, Ladislav: On $\delta n$-semigroups. (English). Archivum Mathematicum, vol. 17 (1981), issue 1, pp. 43-52
• Fabrici, Imrich; Macko, Tibor: On bases and maximal ideals in semigroups. (English). Mathematica Slovaca, vol. 31 (1981), issue 2, pp. 115-120
• Schwarz, Štefan: The role of semigroups in the elementary theory of numbers. (English). Mathematica Slovaca, vol. 31 (1981), issue 4, pp. 369-395
• Anjaneyulu, A.: On primary semigroups. (English). Czechoslovak Mathematical Journal, vol. 30 (1980), issue 3, pp. 382-386
• Jürgensen, H.: Disjunktive Teilmengen inverser Halbgruppen. (German) [Disjoint subsets in inverse semigroups]. Archivum Mathematicum, vol. 15 (1979), issue 4, pp. 205-207
• Luedeman, John K.: Closure operations and semigroups of quotients. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 20 (1979), issue 3, pp. 529-537
• Satyanarayana, M.: Correction to my paper on structure and ideal theory of commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 29 (1979), issue 4, pp. 662-663
• Porubský, Štefan: Correction to my paper: “Commutative semi-primary $x$-semigroups”. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 3, pp. 505
• Sullivan, Robert P.: Ideals in transformation semigroups. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 3, pp. 431-446
• Močkoř, Jiří: Prüfer $d$-groups. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 1, pp. 127-139
• Schwarz, Štefan: Semigroups containing maximal ideals. (English). Mathematica Slovaca, vol. 28 (1978), issue 2, pp. 157-168
• Luedeman, John K.; McMorris, F. R.; Sim, Soon Kiong: Semigroups for which every totally irreducible $S$-system is injective. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 19 (1978), issue 1, pp. 27-35
• Satyanarayana, M.: Structure and ideal theory of commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 28 (1978), issue 2, pp. 171-180
• Porubský, Štefan: Commutative semi-primary $x$-semigroups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 3, pp. 467-472
• Schwarz, Štefan: A counting theorem in the semigroup of circulant Boolean matrices. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 3, pp. 504-510
• Schwarz, Štefan: The ideal structure of $C$-semigroups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 2, pp. 313-338
• Satyanarayana, M.: On commutative semigroups which are unions of a finite number of principal ideals. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 61-68
• Kuroki, Nobuaki: On normal semigroups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 43-53
• Márki, László: Structure theorems on certain regular and inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 3, pp. 388-393
• Zelinka, Bohdan: Tolerance relations on periodic commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 167-169
• Jürgensen, Helmut: Fastideale in vollständig O-einfachen Halbgruppen. (German). Mathematica Slovaca, vol. 26 (1976), issue 2, pp. 73-76
• Johnson, C. S., Jr.; McMorris, F. R.: Nonsingular semilattices and semigroups. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 280-282
• Shum, Kar-Ping: On the Frattini ideal in compact semigroups. (English). Mathematica Slovaca, vol. 26 (1976), issue 4, pp. 309-315
• Šmarda, Bohumil: Polars and X-ideals in semigroups. (English). Mathematica Slovaca, vol. 26 (1976), issue 1, pp. 31-37
• Putcha, Mohan S.: Positive functions from $\mathcal{S}$-indecomposable semigroups into partially ordered sets. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 1, pp. 161-170
• Beehler, Jerry R.; Johanson, Arnold: Semigroups and the structure of categories. (English). Mathematica Slovaca, vol. 26 (1976), issue 3, pp. 207-216
• Satko, Ladislav: The tensor product of right groups. (English). Mathematica Slovaca, vol. 26 (1976), issue 1, pp. 57-61
• Pastijn, Francis: A theorem concerning the restriction of the $\cal D$-structure of a semigroup $S$ to a subsemigroup of $S$. (English). Mathematica Slovaca, vol. 26 (1976), issue 1, pp. 19-22
• Pondělíček, Bedřich: $\cal T$-Prime Subsets in Semigroups. (English). Matematický časopis, vol. 25 (1975), issue 3, pp. 223-229
• Lal, Harbans: Commutative semi-primary semigroups. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 1, pp. 1-3
• Ježek, J.; Kepka, Tomáš: Extensive varieties. (English). Acta Universitatis Carolinae. Mathematica et Physica, vol. 16 (1975), issue 2, pp. 79-87
• Iwanik, A.; Płonka, J.: Linear independence in commutative semigroups. (English). Matematický časopis, vol. 25 (1975), issue 4, pp. 333-338
• Kuczkowski, Joseph E.: On the Embedding of Semigroups into Nilpotent Groups. (English). Matematický časopis, vol. 25 (1975), issue 3, pp. 245-247
• Pondělíček, Bedřich: On weakly commutative semigroups. (English). Czechoslovak Mathematical Journal, vol. 25 (1975), issue 1, pp. 20-23
• Lal, Harbans: Radicals in Quasi-Commutative Semigroups. (English). Matematický časopis, vol. 25 (1975), issue 3, pp. 287-288
• Lal, Harbans: The Regular Ideal in a Semigroup. (English). Matematický časopis, vol. 25 (1975), issue 2, pp. 179-183
• Ježek, Jaroslav; Kepka, Tomáš: Semigroup representations of commutative idempotent Abelian groupoids. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 16 (1975), issue 3, pp. 487-500
• Fabrici, Imrich: Two-Sided Bases of Semigroups. (English). Matematický časopis, vol. 25 (1975), issue 2, pp. 173-178
• Abrhan, Imrich: О минимальных множествах образующих в унарных алгебрах. (Russian) [Minimal Sets of Generators in Unary Algebras]. Matematický časopis, vol. 25 (1975), issue 4, pp. 305-317
• Schwarz, Štefan: Circulant Boolean relation matrices. (English). Czechoslovak Mathematical Journal, vol. 24 (1974), issue 2, pp. 252-253
• Butler, Kim Ki-Hang; Krabill, James Richard: Circulant Boolean relation matrices. (English). Czechoslovak Mathematical Journal, vol. 24 (1974), issue 2, pp. 247-251
• Kapp, Kenneth M.: On $n^\circ $-regular semigroups. (English). Czechoslovak Mathematical Journal, vol. 24 (1974), issue 2, pp. 171-175
• Kolibiarová, Blanka: On a Construction of Some Semigroups. (English). Matematický časopis, vol. 24 (1974), issue 2, pp. 139-144
• Zapletal, Josef: On the characterization of semilattices satisfying the descending chain condition and some remarks on distinguishing subsets. (English). Archivum Mathematicum, vol. 10 (1974), issue 2, pp. 123-128
• Norris, Eugene M.: Relative Act Ideals. (English). Matematický časopis, vol. 24 (1974), issue 3, pp. 195-202
• Lesokhin, M. M.: Об отделимости подполугрупп характерами. (Russian) [On the separation of subsemigroups by characters]. Matematický časopis, vol. 24 (1974), issue 2, pp. 129-138
• Schwarz, Štefan: Суммы степеней бинарных отношений. (Russian) [Sums of Powers of Binary Relations]. Matematický časopis, vol. 24 (1974), issue 2, pp. 161-171
• Satko, Ladislav: Тензорное произведение полугрупп и максимальные полуструктурные образы. (Russian) [Tensor Products of Semigroups and Maximal SemilatticeImages]. Matematický časopis, vol. 24 (1974), issue 3, pp. 239-246
• Kuroki, Nobuaki: Certain fundamental congruences on the tensor product of commutative inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 23 (1973), issue 2, pp. 252-256
• Schein, Boris M.: Completions, translational hulls and ideal extensions of inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 23 (1973), issue 4, pp. 575-610
• Scheiblich, H. E.: Concerning congruences on symmetric inverse semigroups. (English). Czechoslovak Mathematical Journal, vol. 23 (1973), issue 1, pp. 1-9,10
• Huq, Syed A.: A note on mutants in semigroups. (English). Czechoslovak Mathematical Journal, vol. 23 (1973), issue 2, pp. 229-230
• Pondělíček, Bedřich: A Note on Radicals of Semigroups. (English). Matematický časopis, vol. 23 (1973), issue 1, pp. 14-16
• Pondělíček, Bedřich: A Relation for Closure Operations on a Semigroup. (English). Matematický časopis, vol. 23 (1973), issue 3, pp. 249-256
• Pondělíček, Bedřich: A characterization of semilattices of left or right groups. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 4, pp. 522-524
• Satyanarayana, M.: Commutative primary semigroups. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 4, pp. 509-516
• Petrich, Mario: On ideals of a semilattice. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 3, pp. 361-367
• Kuczkowski, Joseph E.: On the Embedding of Semigroups into 2-Engel Groups. (English). Matematický časopis, vol. 22 (1972), issue 4, pp. 282-285
• Kuczkowski, Joseph E.: On the Frattini Ideal in a Certain Class of Semigroups. (English). Matematický časopis, vol. 22 (1972), issue 1, pp. 3-5
• Wiegandt, Richard: On the structure of lower radical semigroups. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 1, pp. 1-6
• Fabrici, Imrich: One-Sided Bases of Semigroups. (English). Matematický časopis, vol. 22 (1972), issue 4, pp. 286-290
• Mukherjee, N. P.: Quasicommutative semigroups. I. (English). Czechoslovak Mathematical Journal, vol. 22 (1972), issue 3, pp. 449-453
• Abrhan, Imrich: O ($H,T$)-ideáloch direktného súčinu pologrúp. (Slovak) [On ($H,T$)-Ideals of the Direct Product of Semigroups]. Matematický časopis, vol. 21 (1971), issue 3, pp. 199-213
• Abrhan, Imrich: Poznámka k maximálnym ($H_1,H_2$)-ideálom v pologrupách. (Slovak) [Note on the Maximal $(H_1,H_2)$-Ideals of Semigroups]. Matematický časopis, vol. 21 (1971), issue 3, pp. 214-218
• Krutský, František: Zobecnění teorému symetrizace. (Czech) [Generalization of symmetrization theorem]. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica-Physica-Chemica, vol. 11 (1971), issue 1, pp. 51-59
• Šulka, Robert: The Maximal Semilattice Decomposition of a Semigroup. (English). Matematický časopis, vol. 21 (1971), issue 4, pp. 269-276
• Kim, Jin Bai: Mutants in the symmetric semigroups. (English). Czechoslovak Mathematical Journal, vol. 21 (1971), issue 3, pp. 355-363
• Pondělíček, Bedřich: A Note on Classes of Regularity in Semigroups. (English). Matematický časopis, vol. 21 (1971), issue 4, pp. 312-317
• Abrhan, Imrich: Note on the Set of Nilpotent Elements and on Radicals of Semigroups. (English). Matematický časopis, vol. 21 (1971), issue 2, pp. 124-130
• Kolibiar, Milan: On a construction of semigroups. (English). Archivum Mathematicum, vol. 7 (1971), issue 2, pp. 99-100
• Saade, Marshall: On some classes of point algebras. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 1, pp. 33-36
• Schwarz, Štefan: On the structure of dual semigroups. (English). Czechoslovak Mathematical Journal, vol. 21 (1971), issue 3, pp. 461-483
• Goralčík, Pavel: One remarkable property of the bicyclic semigroup. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 12 (1971), issue 3, pp. 503-518
• Sasaki, Morio; Tamura, Takayuki: Positive rational semigroups and commutative power joined cancellative semigroups without idempotent. (English). Czechoslovak Mathematical Journal, vol. 21 (1971), issue 4, pp. 567-576
• Pondělíček, Bedřich: Right Prime Ideals and Maximal Right Ideals in Semigroups. (English). Matematický časopis, vol. 21 (1971), issue 2, pp. 87-90
• Šulka, Robert: The Maximal Semilattice Decomposition of a Semigroup, Radicals and Nilpotency. (English). Matematický časopis, vol. 20 (1970), issue 3, pp. 172-180
• Krajňáková, Dorota: On Dual Semigroups. (English). Matematický časopis, vol. 20 (1970), issue 2, pp. 87-91
• Kuczkowski, Joseph E.: On Radicals in a Certain Class of Semigroups. (English). Matematický časopis, vol. 20 (1970), issue 4, pp. 278-280
• Hoehnke, Hans-Jürgen: Zur Einbettung von $\Omega$-Pseudoscharen in Halbgruppen. (German) [On embedding of $\Omega$-pesudofamilies in semigroups]. Archivum Mathematicum, vol. 5 (1969), issue 3, pp. 131-141
• Fabrici, Imrich: Classes of Regularity in Semigroups. (English). Matematický časopis, vol. 19 (1969), issue 4, pp. 299-304
• Fabrici, Imrich: On Periodic Semigroups with One-Sided Identities. (English). Matematický časopis, vol. 19 (1969), issue 2, pp. 145-148
• Markov, Aleksandr Aleksandrovich: Комбинаторная характеристика конечных базисоов чистых свободных полугрупп. (Russian) [A combinatorial characterization of finite bases of pure free semigroups]. Matematický časopis, vol. 19 (1969), issue 2, pp. 158-165
• Zapletal, Josef: Distinguishing subsets of semi-groups and groups. (English). Archivum Mathematicum, vol. 4 (1968), issue 4, pp. 241-251