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The number of connected sparsely edged graphs. IV large nonseparable graphs

โœ Scribed by E. M. Wright


Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
306 KB
Volume
7
Category
Article
ISSN
0364-9024

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โœฆ Synopsis


The number of nonseparable graphs on n labeled points and q lines is u(n, 9). In the second paper of this series an exact formula for u(n, n + k) was found for general n and successive (small) k. The method would give an asymptotic approximation for fixed k as n + 30. Here an asymptotic approximation to u(n, n + k) is found when k = O(n'/') and an approximation to logu(n, n + k ) when k < (1 -E ) ( + n)1'2. The problem of finding an approximation to u(n, 9) when (qn)/nl/' -+ + 33 and q / n -4 logn -4 log logn +x is open.


๐Ÿ“œ SIMILAR VOLUMES


The number of connected sparsely edged g
โœ E. M. Wright ๐Ÿ“‚ Article ๐Ÿ“… 1977 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 472 KB

## Abstract An (__n, q__) graph has __n__ labeled points, __q__ edges, and no loops or multiple edges. The number of connected (__n, q__) graphs is __f(n, q)__. Cayley proved that __f(n, n__^โ€1^) = __n__^nโˆ’2^ and Renyi found a formula for __f(n, n)__. Here I develop two methods to calculate the exp

The number of connected sparsely edged g
โœ E. M. Wright ๐Ÿ“‚ Article ๐Ÿ“… 1978 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 215 KB

A smooth graph is a connected graph without endpoints; f (n, q ) is the number of connected graphs, v(n, q ) is the number of smooth graphs, and u(n, q) is the number of blocks on n labeled points and q edges: wk, V,, and u k are the exponential generating functions of f(n, n + k ) , v(n, n + k). an

The number of connected sparsely edged g
โœ E. M. Wright ๐Ÿ“‚ Article ๐Ÿ“… 1980 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 413 KB

## Abstract The number of connected graphs on __n__ labeled points and __q__ lines (no loops, no multiple lines) is __f(n,q).__ In the first paper of this series I showed how to find an (increasingly complicated) exact formula for __f(n,n+k)__ for general __n__ and successive __k.__ The method woul

Wright's formulae for the number of conn
โœ P. M. D. Gray; A. M. Murray; N. A. Young ๐Ÿ“‚ Article ๐Ÿ“… 1977 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 161 KB

## Abstract We have written computer programs to determine exactly the coefficients in Wright's formula for __f(n, n + k)__, the number of connected sparsely edged labeled graphs (see preceding paper), and used them up to __k__ = 24. We give the results up to __k__ = 7.

The Number of Removable Edges in 3-Conne
โœ Su Jianji ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 147 KB

An edge of a 3-connected graph G is said to be removable if G&e is a subdivision of a 3-connected graph. Holton et al. (1990) proved that every 3-connected graph of order at least five has at least W(|G| +10)ร‚6X removable edges. In this paper, we prove that every 3-connected graph of order at least

Subgraphs of large connectivity and chro
โœ N. Alon; D. Kleitman; C. Thomassen; M. Saks; P. Seymour ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 144 KB

For each pair k, rn of natural numbers there exists a natural number f(k, rn) such that every f ( k , m)-chromatic graph contains a k-connected subgraph of chromatic number at least rn.