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nLab > Latest Changes: ring of Witt vectors

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  1.  
    • CommentRowNumber1.
    • CommentAuthorJohn Baez
    • CommentTimeJun 5th 2021

    Pointed out that the ring of big Witt vectors is represented by the free lambda-ring on one generator (no coincidence; this follows by easy abstract nonsense).

    diff, v32, current

  2. typo

    Yun

    diff, v35, current

  3. typo

    Yun

    diff, v35, current

    • CommentRowNumber4.
    • CommentAuthorJohn Baez
    • CommentTimeJul 30th 2022

    I changed

    If AA is a perfect field then W(A)W(A) is a discrete valuation.

    to

    If AA is a perfect field then W(A)W(A) is a discrete valuation ring.

    since I don’t think the former even parses.

    diff, v36, current

    • CommentRowNumber5.
    • CommentAuthorDavidRoberts
    • CommentTimeJul 30th 2022

    Sadly those links are not even stubs!

    • CommentRowNumber6.
    • CommentAuthorJohn Baez
    • CommentTimeOct 7th 2024
    • (edited Oct 7th 2024)

    Added two more references to modern expositions of Witt vectors: the papers by Lenstra and Ramachandran.

    diff, v41, current

    • CommentRowNumber7.
    • CommentAuthorJohn Baez
    • CommentTimeOct 9th 2024

    A few small clarifications about what’s a truncated Witt ring.

    diff, v42, current

1 to 7 of 7

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