We characterize bipartite Steinhaus graphs in three ways by partitioning them into four classes and we describe the color sets for each of these classes. An interesting recursion had previously been given for the number of bipartite Steinhaus graphs and we give two fascinating closed forms for this
Bipartite Steinhaus graphs
β Scribed by Wayne M. Dymacek
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 523 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
Theorem. A Steinhaus graph is bipartite if and only if it has no triangles.
Theorem. If G is a bipartite Steinhaus graph (G ~-~) with partitions X and Y, where Ixl-< IYI, then G has an X-saturated matching.
π SIMILAR VOLUMES
Let b(n) be the number of bipartite Steinhaus graphs with n vertices. We show that bin) satisfies the recurrence, b(2)=2, b(3)=4, and for k>~2, b(2k+ 1)=2b(k+ 1)+ 1, b(2k) = b(k) + b(k + 1). Thus b(n) <<, ~zn -~ with equality when n is one more than a power of two. To prove this recurrence, we descr
## Abstract A generalized Steinhaus graph of order __n__ and type __s__ is a graph with __n__ vertices whose adjacency matrix (__a__~i,j~) satisfies the relation magnified image where 2 β¦__i__β¦__n__β1, __i__ + __s__(__i__ β 1 β¦ __j__ β¦ __n__, __c__~r,i,j~ Ο΅ {0,1} for all 0 β¦ __r__ β¦ __s__(__i__) β1
Fix any positive integer n. Let S be the set of all Steinhaus graphs of order n(n -1)/2 + 1. The vertices for each graph in S are the first n(n -1)/2 + 1 positive integers. Let I be the set of all labeled graphs of order n with vertices of the form i(i -1)/2 + 1 for the first n positive integers i.