Klein's Absolute Invariant j(τ) under τ→-1/τ in SL(2,R) http://www.youtube.com/watch?v=kvQ7e2AiE2g&feature=youtu.be …
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Klein's Absolute Invariant j(τ) under τ→-1/τ in SL(2,R) http://www.youtube.com/watch?v=kvQ7e2AiE2g&feature=youtu.be …