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Nov 4, 2019 at 22:13 vote accept Edoardo Lanari
Nov 4, 2019 at 22:02 answer added Denis Nardin timeline score: 3
Nov 4, 2019 at 21:51 history edited Edoardo Lanari CC BY-SA 4.0
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Nov 4, 2019 at 19:03 answer added Tim Campion timeline score: 4
Nov 4, 2019 at 14:03 comment added Denis Nardin If all the squares are pullback squares, then $H=ΩC$ (just consider the big square)
Nov 4, 2019 at 13:57 history asked Edoardo Lanari CC BY-SA 4.0