International Journal of Mathematics and Mathematical Sciences
Volume 5 (1982), Issue 4, Pages 745-762
doi:10.1155/S0161171282000696
Equivalence classes of functions on finite sets
Chong-Yun Chao1
and Caroline I. Deisher2
1Department of Mathematics, University of Pittsburgh, Pittsburgh 15260, PA, USA
2Department of Mathematics, Indiana University of Pennsylvania, Indiana 15705, PA, USA
Abstract
By using Pólya's theorem of enumeration and de Bruijn's generalization of Pólya's theorem, we obtain the numbers of various weak equivalence classes of functions in RD relative to permutation groups G and H where RD is the set of all functions from a finite set D to a finite set R, G acts on D and H acts on R. We present an algorithm for obtaining the equivalence classes of functions counted in de Bruijn's theorem, i.e., to determine which functions belong to the same equivalence class. We also use our algorithm to construct the family of non-isomorphic fm-graphs relative to a given group.