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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMay 26th 2014
    • (edited May 26th 2014)

    created exponential exact sequence with the obvious basic comments. Cross-linked with Planck’s constant, with multiplicative group and circle group, and with Kummer sequence.

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeMay 31st 2014

    added a remark on the induced long exact sequence in cohomology, mentioning the first Chern class and the Dixmier-Douady class.