On well directed graphs of a certain type
نویسندگان
چکیده
منابع مشابه
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Let $G$ be a simple graph of order $n$ and size $m$.The edge covering of $G$ is a set of edges such that every vertex of $G$ is incident to at least one edge of the set. The edge cover polynomial of $G$ is the polynomial$E(G,x)=sum_{i=rho(G)}^{m} e(G,i) x^{i}$,where $e(G,i)$ is the number of edge coverings of $G$ of size $i$, and$rho(G)$ is the edge covering number of $G$. In this paper we stud...
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ژورنال
عنوان ژورنال: Časopis pro pěstování matematiky
سال: 1959
ISSN: 0528-2195
DOI: 10.21136/cpm.1959.117296