QC (in Berlin 7/29-??? w/ COVID )@QiaochuYuanReplying to @QiaochuYuan and @uberstuberthis one maybe needs some explanation: https://golem.ph.utexas.edu/category/2016/09/euclidean_hyperbolic_and_ellip.html…1:48 AM · Sep 19, 2020·Twitter for iPad1 Like