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Atrium > Mathematics, Physics & Philosophy: Brunerie's number is 2

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    • CommentRowNumber1.
    • CommentAuthorDavidRoberts
    • CommentTimeFeb 14th 2016
    • (edited Jun 29th 2018)

    Just announced on the homotopy type theory list by Awodey (cryptically, using a blurry photo [1]) and Rijke (in some more detail):

    Guillaume gave a wonderful presentation this afternoon of his proof in HoTT that \pi_4(S^3) is Z/2Z, using the James construction, the Hopf invariant of the Hopf fibration and the Gysin sequence. Synthetic homotopy theory at its best!

    [1] https://plus.google.com/+DavidRoberts/posts/aHPwEompKhS (broken link)

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