The following asymptotic estimation of the maximum number of spanning trees f k (n) in 2kregular circulant graphs ( k ΓΊ 1) on n vertices is the main result of this paper: )) , where
On the number of spanning trees in directed circulant graphs
β Scribed by Zbigniew Lonc; Krzysztof Parol; Jacek M. Wojciechowski
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 117 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0028-3045
- DOI
- 10.1002/net.2
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## Abstract Suppose __G__ is a connected graph and __T__ a spanning tree of __G__. A vertex __v__ Ξ΅ __V__(__G__) is said to be a degreeβpreserving vertex if its degree in __T__ is the same as its degree in __G__. The degreeβpreserving spanning tree problem is to find a spanning tree __T__ of a conn
The quantum mechanical relevance of the concept of a spanning tree extant within a given molecular graph-specifically, one that may be considered to represent the carbon-atom connectivity of a particular (planar) conjugated system-was first explicitly pointed out by Professor Roy McWeeny in his now-
Chvatal established that r(T,, K,,) = (m -1 ) ( n -1 ) + 1, where T, , , is an arbitrary tree of order m and K, is the complete graph of order n. This result was extended by Chartrand, Gould, and Polimeni who showed K, could be replaced by a graph with clique number n and order n + 5 provided n 2 3
If a graph G with cycle rank p contains both spanning trees with rn and with n end-vertices, rn < n, then G has at least 2p spanning trees with k end-vertices for each integer k, rn < k < n. Moreover, the lower bound of 2p is best possible. [ l ] and Schuster [4] independently proved that such span