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arxiv: 1211.0328 · v3 · pith:66W57ASJnew · submitted 2012-11-01 · 🧮 math.CO

Some lower bounds for the L-intersection number of graphs

classification 🧮 math.CO
keywords numberintersectiongraphverticesbipartiteboundsloweronly
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For a set of non-negative integers $L$, the $L$-intersection number of a graph is the smallest number $l$ for which there is an assignment on the vertices to subsets $A_v \subseteq \{1,\dots, l\}$, such that every two vertices $u,v$ are adjacent if and only if $|A_u \cap A_v|\in L$. The bipartite $L$-intersection number is defined similarly when the conditions are considered only for the vertices in different parts. In this paper, some lower bounds for the (bipartite) $L$-intersection number of a graph for various types $L$ in terms of the minimum rank of graph are obtained.

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