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2017-02-06 09:22:27 +0200 | asked a question | weakly-chordal graphs
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2016-01-14 08:41:10 +0200 | asked a question | co-chordal cover number Definition: A graph $G$ is chordal if every induced cycle in $G$ has length 3, and is co-chordal if the complement graph $G^{c}$ is chordal. The co-chordal cover number, denoted cochord $G$, is the minimum number of co-chordal subgraphs required to cover the edges of G. How to find the cochord($G$) ? Please give some hint Thanks in advance |
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2016-01-12 13:05:36 +0200 | asked a question | Convert graph into ideal in polynomial ring Let $G = (V (G), E(G))$ denote a finite simple (no loops or multiple edges) undirected graph with vertices $V (G) =\ {x_1 ,\ldots, x_n }$ and edge set $E(G)$ . By identifying the vertices with the variables in the polynomial ring $R = k[x_1 ,\ldots, x_n ]$ (where $k$ is a field), we can associate to each simple graph $G$ a monomial ideal $ I(G) = ({ x_i x_j |{x_i , x_j } \in E(G)})$ How to convert graph into ideal in sage ? Suppose $G$ is cycle graph. can i get ideal with generator $(x_1x_2,x_2x_3,x_3x_4,x_4x_5,x_1x_5)$ in $k[x_1,\ldots ,x_5]$ Please give some hint. Thanks in advance |