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Sep 15, 2022 at 18:54 comment added LSpice @‍DavidRoberts's answer referenced by @NoamD.Elkies.
Sep 10, 2018 at 12:39 history edited Jose Brox CC BY-SA 4.0
Corrected the link
Mar 28, 2017 at 15:44 comment added Noam D. Elkies There is Lang's "SL$_2(\bf R)$", which is the highest-voted answer to this question (by David Roberts).
Sep 28, 2012 at 8:14 comment added shane.orourke J.-P. Serre also has a book entitled $SL_2$'. No wait, come to think of it the title also mentions Arbres, amalgames', whatever they are.
Dec 16, 2011 at 13:26 history answered François Brunault CC BY-SA 3.0