Dominating functions and total dominating functions of countable graphs
β Scribed by Vijayakumar, G.R.
- Book ID
- 121240850
- Publisher
- Elsevier Science
- Year
- 2013
- Tongue
- English
- Weight
- 589 KB
- Volume
- 313
- Category
- Article
- ISSN
- 0012-365X
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π SIMILAR VOLUMES
A total dominating function (TDF) of a graph G = (V, E) is a function f : V β [0, 1] such that for each v β V , the sum of f values over the open neighbourhood of v is at least one. Zero-one valued TDFs are precisely the characteristic functions of total dominating sets of G. We study the convexity
We show that any tree that has a universal minimal total dominating function has one which only takes 0-1 values. K 3 demonstrates that this fails for graphs in general. Given a graph G =(V, E), for each vertex ve V let F(v) be the set of its neighbours (in particular, not including v itself). A to
## Abstract A total dominating function (TDF) of a graph __G__ = (__V, E__) is a function __f__: __V__ β [0, 1] such that for each __v__ Ο΅ V, Ξ£~uΟ΅N(v)~ f(u) β₯ 1 (where __N__(__v__) denotes the set of neighbors of vertex __v__). Convex combinations of TDFs are also TDFs. However, convex combinations