On the sum number of wheels
نویسندگان
چکیده
منابع مشابه
Labelling Wheels for Minimum Sum Number
A simple undirected graph G is called a sum graph if there exists a labelling L of the vertices of G into distinct positive integers such that any two distinct vertices u and v of G are adjacent if and only if there is a vertex w whose label L(w) = L(u) + L(v). It is obvious that every sum graph has at least one isolated vertex, namely the vertex with the largest label. The sum number (H) of a ...
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15 صفحه اولthe unit sum number of discrete modules
in this paper, we show that every element of a discrete module is a sum of two units if and only if its endomorphism ring has no factor ring isomorphic to $z_{2}$. we also characterize unit sum number equal to two for the endomorphism ring of quasi-discrete modules with finite exchange property.
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ژورنال
عنوان ژورنال: Discrete Mathematics
سال: 2001
ISSN: 0012-365X
DOI: 10.1016/s0012-365x(00)00347-2