reserve p,q for Rational;
reserve g,m,m1,m2,n,n1,n2 for Nat;
reserve i,i1,i2,j,j1,j2 for Integer;

theorem Th7:
  i div (i gcd n) = i / (i gcd n)
  proof
    i gcd n divides i & i gcd n divides n by INT_2:def 2;
    hence thesis by Th6;
  end;
