theorem Th57: :: JGRAPH_7:57

for a, b, c, d being Real
for h being Function of (TOP-REAL 2),(TOP-REAL 2)
for f being Function of I[01],(TOP-REAL 2)
for I being Point of I[01] st c < d & h = AffineMap ((2 / (b - a)),(- ((b + a) / (b - a))),(2 / (d - c)),(- ((d + c) / (d - c)))) & (f . I) `2 = c holds
((h * f) . I) `2 = - 1