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The group $\SL(2,\R)$ acts on the upper half-plane via linear fractional transformation, given by $$ \begin{pmatrix}a&b\\c&d \end{pmatrix}(z) = \frac{a z + b}{c z + d} . $$

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  • Last edited by Alex J. Best on 2019-05-25 09:07:50
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