The subdivision number of a graph G is defined to be the minimum number of extra vertices inserted into the edges of G to make it isomorphic to a unit-distance graph in the plane. Let t (n) denote the maximum number of edges of a C 4 -free graph on n vertices. It is proved that the subdivision numbe
✦ LIBER ✦
On the dimension to represent a graph by a unit distance graph
✍ Scribed by Hiroshi Maehara; Vojtech Rödl
- Book ID
- 105309172
- Publisher
- Springer Japan
- Year
- 1990
- Tongue
- English
- Weight
- 133 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0911-0119
No coin nor oath required. For personal study only.
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## Abstract In this note, we show how the determinant of the distance matrix __D(G__) of a weighted, directed graph __G__ can be explicitly expressed in terms of the corresponding determinants for the (strong) blocks __G~i~__ of __G__. In particular, when cof __D(G__), the sum of the cofactors of _