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Feb 11, 2021 at 13:30 history edited KConrad CC BY-SA 4.0
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Feb 11, 2021 at 13:29 comment added KConrad The last proposition of Chapter IV in Serre’s Course in Arithmetic (before the appendix) answers your question.
Feb 11, 2021 at 12:58 history asked Артемий Соколов CC BY-SA 4.0