theorem Th107: :: JGRAPH_4:107

for sn being Real
for q being Point of (TOP-REAL 2) st - 1 < sn & q `1 > 0 & (q `2) / |.q.| < sn holds
for p being Point of (TOP-REAL 2) st p = (sn -FanMorphE) . q holds
( p `1 > 0 & p `2 < 0 )