We study the class of directed graphs that have indegree = outdegree = 2 a t every vertex. These digraphs can be decomposed uniquely into "alternating cycles"; w e use this decomposition to present efficient techniques for counting and generating them. The number (up to isomorphism) of these digraph
Computer enumeration and generation of physical trees
✍ Scribed by J. V. Knop; W. R. Müller; K. Szymanski; H. W. Kroto; N. Trinajstić
- Publisher
- John Wiley and Sons
- Year
- 1987
- Tongue
- English
- Weight
- 336 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0192-8651
No coin nor oath required. For personal study only.
✦ Synopsis
A computer-oriented method for the enumeration and generation of physical trees is presented. Physical trees depict acyclic chemical structures, but the term physical is used to stress the process by which the structures are produced.
📜 SIMILAR VOLUMES
A Maple V computer program for obtaining conventional algebraic representations of coupled-cluster equations is described and its use illustrated. The program is available on the World Wide Web.
## Abstract We investigate signings of symmetric GDD($16 \times 2^i$, 16, $2^{4-i}$)s over $Z\_2$ for $1 \le i \le 3$. Beginning with $i=1$, at each stage of this process a signing of a GDD($16 \times 2^i$, 16, $2^{4-i}$) produces a GDD($16 \times 2^{i+1}$, 16, $2^{4-i-1}$). The initial GDDs ($i=1$