( LSeg (|[0,0]|,|[0,1]|) = { p1 where p1 is Point of (TOP-REAL 2) : ( p1 `1 = 0 & p1 `2 <= 1 & p1 `2 >= 0 ) } & LSeg (|[0,1]|,|[1,1]|) = { p2 where p2 is Point of (TOP-REAL 2) : ( p2 `1 <= 1 & p2 `1 >= 0 & p2 `2 = 1 ) } & LSeg (|[0,0]|,|[1,0]|) = { q1 where q1 is Point of (TOP-REAL 2) : ( q1 `1 <= 1 & q1 `1 >= 0 & q1 `2 = 0 ) } & LSeg (|[1,0]|,|[1,1]|) = { q2 where q2 is Point of (TOP-REAL 2) : ( q2 `1 = 1 & q2 `2 <= 1 & q2 `2 >= 0 ) } )