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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeDec 14th 2012

    expanded E6 a bit.

    • CommentRowNumber2.
    • CommentAuthorDavid_Corfield
    • CommentTimeDec 17th 2020

    Added this fact mentioned by John Baez here:

    The Dynkin diagram of E 6E_6 has 2-fold symmetry, corresponding to a outer automorphism of order 2. E 6E_6 acts on the octonionic projective plane and its nontrivial outer automorphism gives rise to a projective duality in its geometry.

    diff, v11, current

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