http://mathoverflow.net/questions/242474/automorphic-forms-associated-with-vertices-of-uniform-honeycombs-in-hyperbolic-s … (my retina is lattices and lifts, I think)
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http://mathoverflow.net/questions/242474/automorphic-forms-associated-with-vertices-of-uniform-honeycombs-in-hyperbolic-s … (my retina is lattices and lifts, I think)