Homomorphism and sigma polynomials

Richard Alan Gillman
1995 International Journal of Mathematics and Mathematical Sciences  
By establishing a connection between the sigma polynomial and the homomorphism polynomial, many of the proofs for computing the sigma polynmial are simplified, the homomorphism polynomial can be identified for several new classes of graphs, and progress can be made on identifying homomorphism polynomials.
doi:10.1155/s0161171295000834 fatcat:svqhhghuivebthfejwgzfzlsey