On the Idempotent Structure of Cyclic Subgroups in Finite Rings Z_n

This research provides a rigorous structural analysis of cyclic subgroups within finite rings Z_n. The study establishes a necessary and sufficient condition for the existence of cyclic structures, governed by the power index k. We highlight a critical distinction in cyclic behavior: while cyclic subgroups in finite fields (Z_p) are uniquely determined by their order m=k-1, rings with zero-divisors (such as Z_n) exhibit degenerate orbits where equal order does not imply subgroup equality. This work offers a robust framework for classifying cyclic substructures and identifies the structural divergence between fields and composite rings.