The number of spanning trees in buckminsterfullerene
โ Scribed by T. J. N. Brown; R. B. Mallion; P. Pollak; Branca R. M. de Castro; J. A. N. F. Gomes
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 662 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0192-8651
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โฆ Synopsis
Abstract
The theorem of Gutman et al. (1983) is applied to calculate the number of spanning trees in the carbonโcarbon connectivityโnetwork of the recently diagnosed C~60~โcluster buckminsterfullerene. This โcomplexityโ turns out to be approximately 3.75 ร 10^20^ and it is found necessary to invoke the device of modulo arithmetic and the โChinese Remainder Theoremโ in order to evaluate it precisely on a small computer. The exact spanningtree count for buckminsterfullerene is 375 291 866 372 898 816 000, or, 2^25^ ร 3^4^ ร 5^3^ ร 11^5^ ร 19^3^. A โringcurrentโ calculation by the method of McWeeny may be based on any desired one of this vast number of spanning trees.
๐ SIMILAR VOLUMES
A rccenl theorem due to W'aller is applied to the mokculnr gmph of a typical conjugtcd system (naphthalene) in order to demonstrate the enumeration of spanning trees, on each of which a "ring current" calculation may be based.
Let 3:; denote the set of simple graphs with n vertices and m edges, t ( G ) the number of spanning trees of a graph G , and F 2 H if t(K,\E(F))?t(K,\E(H)) for every s? max{u(F), u ( H ) } . We give a complete characterization of >-maximal (maximum) graphs in 3:; subject to m 5 n . This result conta
proved that the spanning trees of a 2-cactus partition into at least 3 isomorphism classes. Here we examine the structure of these 2-cacti for which the spanning trees partition into exactly 3 isomorphism classes.
The problem is to determine the linear graph that has the maximum number of spanning trees, where only the number of nodes N and the number of branches B are prescribed. We deal with connected graphs G(N, B) obtained by deleting D branches from a complete graph KN. Our solution is for D less than or