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Counting f such that f o g = g o f

By: Y. Yeh; W. Ke; Y. Fong; P. Bouchard;

1997 / Springer Science+Business Media / 0378-6218


In this paper, we derive an algorithm for finding all the mappings f of a finite set A which commute with a fixed mapping g: A → A. This algorithm is then applied to finding all the infra-endomorphisms of the groups ℤ.