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Mar 12, 2021 at 7:31 vote accept zxzx179
Mar 12, 2021 at 7:31 answer added Denis Serre timeline score: 2
Mar 12, 2021 at 7:29 comment added Denis Serre @FedorPetrov. $D$ is diagonal.
Mar 12, 2021 at 7:01 history asked zxzx179 CC BY-SA 4.0