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 Th53:
  (m gcd n) lcm n = n
proof
  set M = m gcd n;
  M divides n by NAT_D:def 5;
  hence thesis by Th44;
end;
