A Zq-Fan theorem

In 1952, Ky Fan proved a combinatorial theorem generalizing the Borsuk-Ulam theorem stating that there is no Z2-equivariant map from the d-dimensional sphere S to the (d − 1)-dimensional sphere Sd−1. The aim of the present paper is to provide the same kind of combinatorial theorem for Dold's theorem, which is a generalization of the Borsuk-Ulam theorem when Z2 is replaced by Zq, and the spheres replaced by d-dimensional (d − 1)-connected free Zq-spaces. It provides a combinatorial proof of Dold's theorem. Moreover, the proof does not work by contradiction.