A dominating set for a graph G = (V, E) is a subset of vertices V ⊆ V such that for all v ∈ V -V there exists some u ∈ V for which {v, u} ∈ E. The domination number of G is the size of its smallest dominating set(s). We show that for almost all connected graphs with minimum degree at least 2 and q e
Total domination in graphs with minimum degree three
✍ Scribed by Favaron, Odile; Henning, Michael A.; Mynhart, Christina M.; Puech, Jo�l
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 132 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0364-9024
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✦ Synopsis
A set S of vertices of a graph G is a total dominating set, if every vertex of V (G) is adjacent to some vertex in S. The total domination number of G, denoted by γ t (G), is the minimum cardinality of a total dominating set of G. We prove that, if G is a graph of order n with minimum degree at least 3, then γ t (G) ≤ 7n/13.
📜 SIMILAR VOLUMES
The total interval number of an n-vertex graph with maximum degree ∆ is at most (∆+1/∆)n/2, with equality if and only if every component of the graph is K ∆,∆ . If the graph is also required to be connected, then the maximum is ∆n/2 + 1 when ∆ is even, but when ∆ is odd it exceeds [∆ + 1/(2.5∆ + 7.7
It is proved that a planar graph with maximum degree ∆ ≥ 11 has total (vertex-edge) chromatic number ∆ + 1.
A total dominating function (TDF) of a graph G = (V, E) is a function f : V → [0, 1] such that for each v ∈ 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