Isomorphismen von Kontexten und Konzeptualverbänden
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František Machala (1993)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
René Fourneau (1975)
Bulletin de la Société Mathématique de France
Ján Jakubík (2004)
Discussiones Mathematicae - General Algebra and Applications
In this paper we investigate sufficient conditions for the validity of certain implications concerning direct products of lattice-ordered groups.
Věra Trnková, Václav Koubek (1978)
Commentationes Mathematicae Universitatis Carolinae
Perović, Ž. (1995)
Publications de l'Institut Mathématique. Nouvelle Série
Eduard Fuchs (1965)
Archivum Mathematicum
Larose, Benoit (2005)
Beiträge zur Algebra und Geometrie
Danny Rorabaugh, Claude Tardif, David Wehlau, Imed Zaguia (2018)
Commentationes Mathematicae Universitatis Carolinae
The arc graph of a digraph is the digraph with the set of arcs of as vertex-set, where the arcs of join consecutive arcs of . In 1981, S. Poljak and V. Rödl characterized the chromatic number of in terms of the chromatic number of when is symmetric (i.e., undirected). In contrast, directed graphs with equal chromatic numbers can have arc graphs with distinct chromatic numbers. Even though the arc graph of a symmetric graph is not symmetric, we show that the chromatic number of the...
Martin Gavalec (1985)
Colloquium Mathematicae
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