Richard Alan Gillman, "Homomorphism and sigma polynomials", International Journal of Mathematics and Mathematical Sciences, vol. 18, Article ID 752104, 6 pages, 1995. https://doi.org/10.1155/S0161171295000834
Homomorphism and sigma polynomials
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.
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