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Jun 1, 2020 at 15:56 comment added Pengfei Thank you for the clarification!
Jun 1, 2020 at 15:39 comment added mme This is in fact an equivalence, since every 2-dimensional homology class is represented by a closed surface.
Jun 1, 2020 at 14:12 vote accept Pengfei
Jun 1, 2020 at 13:32 history answered Ben McKay CC BY-SA 4.0