Integral periodic orbits on affine spaces

In this paper, we give an elementary proof on the existence of an effective uniform upper bound on the size of integral periodic orbits of a single endomorphism in an affine space, dependent solely on its dimension. In fact, we derive a formula relating the primitive period to the local primitive period obtained through reduction modulo prime number. In particular, we prove that the size of any integral periodic orbit in the affine plane does not exceed 24.