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Sep 10, 2018 at 17:46 vote accept Simon Lentner
Apr 13, 2017 at 12:58 history edited CommunityBot
replaced http://mathoverflow.net/ with https://mathoverflow.net/
Jun 20, 2016 at 22:56 comment added LSpice @BenMcKay, if not, then he may need a spin doctor.
Jun 20, 2016 at 20:43 comment added Alex Degtyarev For curves, one could mimic Spin structures as square roots of $K$.
Jun 20, 2016 at 20:18 answer added Qiaochu Yuan timeline score: 5
Jun 20, 2016 at 19:35 history asked Simon Lentner CC BY-SA 3.0