Matrix Rqrresentation and Eigenvalue Problems of Undirected Graphs

The use of the automorphism group (based on griq>h theory) as a tool for describing the synunetiy of nonri^d molecules represents a current frequent application of graph theory to chemistry.

Pólya’s theory on the enumeration of nonequivalent isomers of a jpven class of compounds employs the automorphism group of a wreath of edges comprising definite vertices. .