for P being Subset of (TOP-REAL 2) holds
( (SW-corner P) `1 = (W-min P) `1 & (SW-corner P) `1 = (W-max P) `1 & (W-min P) `1 = (W-max P) `1 & (W-min P) `1 = (NW-corner P) `1 & (W-max P) `1 = (NW-corner P) `1 )