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Discreteness is undecidable


Speaker: Michael Kapovich, UC Davis
Location: 2112 MSB
Start time: Tue, Nov 17 2015, 1:10PM

I will explain why the question if a pair of matrices A, B in SL(2,C) generates a discrete subgroup is undecidable with respect to the Blum-Shub-Smale model of computations with real numbers.