## 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__^โ1^) = __n__^nโ2^ and Renyi found a formula for __f(n, n)__. Here I develop two methods to calculate the exp
The number of connected sparsely edged graphs. IV large nonseparable graphs
โ Scribed by E. M. Wright
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- English
- Weight
- 306 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
โฆ 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.
๐ SIMILAR VOLUMES
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
## 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
## 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.
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)ร6X removable edges. In this paper, we prove that every 3-connected graph of order at least
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.