Characterizations of Non-Singular Cycles,
Path and Trees
S. Sookyang, S. Arworn 1 and P. Wojtylak
Abstract: A simple graph is said to be non-singular if its adjacency matrix is non-singular.
In this paper, we find the characterization of non-singular cycles and trees. Main Theorems:
1. A cycle Cn of n points is non-singular iff n is not divided by 4.
2. A path Pn is non-singular if and only if n is even.
3. A tree T is non-singular iff T has an even number of points and contains a sesquivalent
spanning subgraph.
Keywords : Simple graph, adjacency matrix, non-singular graph, cycle, tree.
2000 Mathematics Subject Classification : 90B10, 05C05, 05C50