
theorem INT615:
  for i,j being Nat st i,j are_coprime holds i lcm j = i * j
  proof
    let i, j be Nat;
    reconsider ii = i, jj = j as Integer;
    |.ii * jj.| = ii * jj by ABSVALUE:def 1;
    hence thesis by INT_6:15;
  end;
