Visualizing SL₂ℤ: Identify SL₂ℝ (which is a solid torus) with the complement of a solid torus in ℝ³ plus a point at ∞ for the identity. The elements of SL₂ℤ are the dots, colored by type (hyp/ell/par), sized by 1/norm. SL₂ℤ is discrete, hence the picture is bounded.pic.twitter.com/mNetrmytta
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Replying to @_daviddumas
Also, movies of SL(2,R) actions on this might be nifty?
8:07 AM - 12 Nov 2019
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