for P being Subset of (TOP-REAL 2) holds
( (NW-corner P) `2 = (N-min P) `2 & (NW-corner P) `2 = (N-max P) `2 & (N-min P) `2 = (N-max P) `2 & (N-min P) `2 = (NE-corner P) `2 & (N-max P) `2 = (NE-corner P) `2 )