reserve i,j,k,n,m,l,s,t for Nat;
reserve a,b for Real;
reserve F for real-valued FinSequence;
reserve z for Complex;
reserve x,y for Complex;
reserve r,s,t for natural Number;

theorem Th8:
  x|^(s+t) = x|^s * x|^t
proof
  reconsider x as Element of COMPLEX by XCMPLX_0:def 2;
  x|^s*x|^t = Product((s+t) |-> x) by RVSUM_1:111;
  hence thesis;
end;
