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Author: Länger, Helmut

• 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; 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; 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; Länger, Helmut: Groupoids assigned to relational systems. (English). Mathematica Bohemica, vol. 138 (2013), issue 1, pp. 15-23
• Dorfer, Gerhard; Dorninger, Dietmar; Länger, Helmut: On the structure of numerical event spaces. (English). Kybernetika, vol. 46 (2010), issue 6, pp. 971-981
• 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; 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; Länger, Helmut: A note on normal varieties of monounary algebras. (English). Czechoslovak Mathematical Journal, vol. 52 (2002), issue 2, pp. 369-373
• 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
• Dorfer, Gerhard; Dvurečenskij, Anatolij; Länger, Helmut: Symmetric difference in orthomodular lattices. (English). Mathematica Slovaca, vol. 46 (1996), issue 5, pp. 435-444
• Länger, Helmut; Mączyński, Maciej: On a characterization of probability measures on Boolean algebras and some orthomodular lattices. (English). Mathematica Slovaca, vol. 45 (1995), issue 5, pp. 455-468
• Länger, Helmut: C-S-maximal superassociative systems. II. (English). Mathematica Slovaca, vol. 34 (1984), issue 1, pp. 89-95