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Nov 5, 2020 at 22:24 comment added Carl-Fredrik Nyberg Brodda @YCor The Ptolemy group $T$ and Thompson's group $T$ have different definitions -- but happen to be isomorphic. So some authors call $T$ the Ptolemy-Thompson group, but it's all the same $T$.
Nov 5, 2020 at 20:11 comment added YCor How is the Ptolemy-Thompson group $T$ related to Thompson's group $T$? or are these the same?
Nov 5, 2020 at 20:05 history answered AGenevois CC BY-SA 4.0