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    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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    https://brainmass.com/math/functional-analysis/mobius-transformations-example-problem-123078

    Solution Preview

    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, ...

    Solution Summary

    A Mobius transformation is investigated. The solution is detailed and well presented.

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