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Oct 13, 2022 at 17:36 comment added dohmatob Indeed. I meant "symmetric about coordinate axes". Fixed.
Oct 13, 2022 at 17:35 history edited dohmatob CC BY-SA 4.0
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Oct 13, 2022 at 13:02 comment added gerw This seems not to be the usual definition of centrally symmetric (which should be $C = -C$).
Oct 13, 2022 at 9:46 answer added Steve timeline score: 2
Oct 13, 2022 at 9:31 history edited dohmatob CC BY-SA 4.0
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Oct 13, 2022 at 9:21 history edited dohmatob CC BY-SA 4.0
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Oct 13, 2022 at 8:29 history asked dohmatob CC BY-SA 4.0