reserve r,t for Real;
reserve i for Integer;
reserve k,n for Nat;
reserve p for Polynomial of F_Real;
reserve e for Element of F_Real;
reserve L for non empty ZeroStr;
reserve z,z0,z1,z2 for Element of L;

theorem Th3:
  |.i.| <= 2 implies i = -2 or i = -1 or i = 0 or i = 1 or i = 2
  proof
    assume |.i.| <= 2;
    then |.i.| = 0 or ... or |.i.| = 2;
    hence thesis by ABSVALUE:2,Th2;
  end;
