Die Struktur der Monoide binärer Relationen auf endlichen Mengen.
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A Proof of Devadze's Theorem on Generators of the Semigroup of Boolean Matrices.
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The Semigroup Generated by Regular Boolean Matrices.
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Green's Equivalences in Finite Semigroups of Binary Relations.
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Semigroups of binary Relations.
PhD thesis, The Pennsylvania State University, University Park, PA, 1992.
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Boolean Matrix Theory and Applications.
1982.
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Primes in the Semigroup of Boolean Matrices.
Linear Algebra and its Applications, 37:119-134, 1981.
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Prime boolean matrices.
In: Combinatorial Mathematics VII, volume 829, series Lecture Notes in Mathematics, pages 76-82. 1980.
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Inverses of Boolean matrices.
Linear Algebra and its Applications, 22:247-262, 1978.
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On generating regular elements in the semigroup of binary relations.
Semigroup Forum, 14:29-32, 1977.
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Bounds on the index and period of a binary relation on a finite set.
Semigroup Forum, 13:253-259, 1977.
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A characterization of an inverse for semigroup elements.
Seminar Report, Alabama State University, 1976.
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Regular elements of the semigroup of all binary relations.
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Groups of Binary Relations.
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On the semigroup of binary relations.
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Maximal Subgroups of the Semigroup of Relations.
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A theorem on the semigroup of binary relations.
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Die Halbgruppe der binären Relationen.
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