proposition: Lemma Str_nth_powers (n : nat) : Str_nth n powers = a ^ (f n).
proof: Proof. unfold powers. rewrite Str_nth_powers_help. ring. Qed.
imports: Coq.setoid_ring.Ring Coq.Arith.Factorial MathClasses.misc.workaround_tactics MathClasses.interfaces.abstract_algebra MathClasses.interfaces.additional_operations MathClasses.interfaces.orders MathClasses.interfaces.naturals MathClasses.interfaces.integers MathClasses.theory.nat_pow MathClasses.theory.int_pow MathClasses.theory.streams