
theorem Th04:
  for P being Point of BK-model-Plane
  for p being Element of BK_model st P = p holds
  BK_to_T2 P = BK_to_REAL2 p & Tn2TR BK_to_T2 P = BK_to_REAL2 p
  proof
    let P be Point of BK-model-Plane;
    let p be Element of BK_model;
    assume
A1: P = p;
    ex p be Element of BK_model st P = p &
    BK_to_T2 P = BK_to_REAL2 p by Def01;
    hence thesis by A1;
  end;
