Mathematics – Combinatorics
Scientific paper
2008-12-23
Bull. Soc. Sci. Lett. Lodz. Ser. Rech. Deform.vol 60 No2 (2010): 65--71
Mathematics
Combinatorics
6 pages, 2 figures,affiliated to The Internet Gian-Carlo Polish Seminar: http://ii.uwb.edu.pl/akk/sem/sem_rota.htm
Scientific paper
A digraph that represents reasonably a scheduling problem should be a directed acyclic graph. Here down we shall deal with special kind of graded $DAGs$ named $KoDAGs$. For their definition and first primary properties see $ [1]$, where natural join of directed biparted graphs and their corresponding adjacency matrices is defined and then applied to investigate cobweb posets and their $Hasse$ digraphs called $KoDAGs$. In this report we extend the notion of cobweb poset while delivering some elementary consequences of the description and observations established in $[1]$.
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