:: deftheorem defines outside_of_rectangle JGRAPH_6:def 3 :
for a, b, c, d being Real holds outside_of_rectangle (a,b,c,d) = { p where p is Point of (TOP-REAL 2) : ( not a <= p `1 or not p `1 <= b or not c <= p `2 or not p `2 <= d ) } ;