Mobius Transformations
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Suppose T is a Mobius transformation such that the image of the real axis under T is the real axis. Prove that T may be written in the form T(z) = (az+b)/(cz+d) with a, b, c, and d real.
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Solution Summary
A Mobius transformation is investigated. The solution is detailed and well presented.
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Proof:
Since T is a Mobius transformation, we can assume T(z)=(az+b)/(cz+d). Now we want to show that a,b,c,d can be written as all reals.
First, T(0)=b/d=r is a real, then b=rd, ...
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