The Number of Group Homomorphisms from $D_m$ into $D_n$

Details The Number of Group Homomorphisms from $D_m$ into $D_n$ The Number of Group Homomorphisms from $D_m$ into $D_n$

2012-01-11

arxiv.org/abs/1201.2363v3

Mathematics

Group Theory

Scientific paper

Counting homomorphisms between cyclic groups is a common exercise in a first course in abstract algebra. A similar problem, accessible at the same level, is to count the number of group homomorphisms from a dihedral group of order $2m$ into a dihedral group of order $2n$. While the solution requires only elementary group theory, the result does not appear in the literature or in the usual texts. As the solution may be of interest, particularly to those teaching undergraduate abstract algebra, it is provided in this note.

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