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Can anyone guide me to a good site for the special linear group $SL(2,R)$, especially one that goes deep into its subgroup and normal subgroup? Book recommendations would be great too.

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    Thank you, @Peter, I think I'd enjoy this2012-10-26

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Read $SL_2(R)$ by Serge Lang. The title is exactly the topic you are looking for!

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    Who knew? (I guess you did!)2012-11-29