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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeOct 19th 2020

    added these pointers on the first Pontrjagin class as counting gravitational instanton number:

    diff, v24, current

    • CommentRowNumber2.
    • CommentAuthorDmitri Pavlov
    • CommentTimeNov 13th 2021


    The original definition is in

    • Л. С. Понтрягин, Характеристические циклы многообразий, ДАН, XXXV, № 2 (1942).

    • Л. С. Понтрягин, Характеристические циклы дифференцируемых многообразий, Матем. сб., 21(63):2 (1947), 233–284. MathNet.Ru PDF. English translation: Lev Pontrjagin, Characteristic cycles on differentiable manifolds, Mat. Sbornik N. S. 21(63) (1947), 233-284; A.M.S. Translation 32 (1950).

    diff, v29, current

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeNov 14th 2021

    Thanks, that’s good to have. I have copied these two items also to the author page, here.

    • CommentRowNumber4.
    • CommentAuthorDmitri Pavlov
    • CommentTimeJan 2nd 2023

    Added references to two more translations of Pontrjagin’s original articles.

    diff, v30, current