is there anybody knowing engineering maths on sunday?

Question

I have an urgent problem need to be work out,
the problem is:

"Prove if z1,z2,z3 are distinct points,and w1,w2,w3 are distinct points,then the Mobius transformation T satisfying T(z1)=w1,T(z2)=w2,T(z3)=w3 is unique.[hints:S is another
such Mobius transformation and consider the fixed points of composition T^1.S]"

If nobody can solve this question,can anybody suggest a better website to do it such as online tutor...

Answer 1

Wikipedia is your friend. In this case, take a look at:
http://en.wikipedia.org/wiki/M%C3%B6bius_transformation#Specifying_a_transformation_by_three_points
as well as the rest of the article.