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Dec 8, 2023 at 16:10 comment added Z. M The multiplicative group $1+A[\![T]\!]$ is precisely the big Witt vectors of $A$.
Dec 8, 2023 at 12:00 history edited YCor CC BY-SA 4.0
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Dec 8, 2023 at 11:54 history edited M.G. CC BY-SA 4.0
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Dec 8, 2023 at 0:07 history edited M.G. CC BY-SA 4.0
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Dec 7, 2023 at 23:50 history asked M.G. CC BY-SA 4.0