theorem Th3: :: JGRAPH_7:3

for p1, p2 being Point of (TOP-REAL 2)
for b, c, d being Real st p1 `1 < b & p1 `1 = p2 `1 & c <= p1 `2 & p1 `2 < p2 `2 & p2 `2 <= d holds
LE p1,p2, rectangle ((p1 `1),b,c,d)