Question
Show that there is only one linear fractional transformation that maps three given distinct points z1, z2 and z3 in the extended z plane onto three specified distinct points w1, w2 and w3 in the extended w plane.
Answer :
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A linear fractional transformation has the form [ w=\phi(z)=\frac{az+b}{cz+d}, ] where (a,b,c,d) are complex constants not all zero and (ad-bc\neq 0). Such a transformation is completely determined up to a nonzero common factor multiplying (a,b,c,d). Consider three distinct points (z_1,z_2,z_3) in the extended (z)-plane and three distinct points (w_1,w_2,w_3) in the extended (w)-plane. A fundamental property of linear fractional transformations is the invariance of the cross-ratio. For any four distinct points, [
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