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- W2166612527 abstract "One introduces here the natural join $P os Q$ of graded posets $ $ and $ $ with correspondingly maximal and minimal sets being identical as expressed by ordinal sum $Poplus Q$ apart from other definition and due to that one arrives at a simple proof of the $M{{o}}bius $ function formula for cobweb posets. We also quote the other authors explicit formulas for the zeta matrix and its inverse for any graded posets with the finite set of minimal elements from earlier works of the author. These formulas are based on the formulas for cobweb posets and their $Hasse$ diagrams or graphs named $KoDAGs$ which are interpreted as chains of binary complete or universal relations joined by the natural join operation. Natural join of two independent sets is therefore the ordinal sum of this trivially ordered posets represented also by directed biclique named dibiclique and correspondingly by their $Hasse $ diagrams or graphs named $KoDAGs$. Such cobweb posets and equivalently their Hasse diagrams or graphs named $KoDAGs$ are also encoded by discrete hyper-boxes and the natural join operation of such discrete hyper boxes is just cartesian product of them accompanied with projection out of common faces. All graded posets with no mute vertices in their $Hasse$ diagrams which means that no vertex has indegree or outdegree equal zero are natural join of chain of relations and may be at the same time interpreted an $n-ary$ relation, $n in N cup {infty }$." @default.
- W2166612527 created "2016-06-24" @default.
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- W2166612527 date "2009-07-15" @default.
- W2166612527 modified "2023-09-27" @default.
- W2166612527 title "Natural join construction of graded posets versus ordinal sum and discrete hyper boxes" @default.
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