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nLab > Latest Changes: strict 2-group

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  1.  
    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeDec 16th 2009
    • (edited Dec 16th 2009)

    considerably expanded the entry strict 2-group.

    • Apart from adding an introductory discussion, and expanding the list of examples, in particular by adding that of automorphism 2-groups ...

    • ... I in particular give the detailed translation prescription for how to encode a 2-group by a crossed module at In terms of crossed modules

    This is to eventually serve as a supplement to the discussion at nonabelian group cohomology. So I spent some energy on disentangling the four different (though isomorphic) ways a crossed module gives rise to a 2-group (following my article with David Roberts).

  2. Fix references typesetting

    Anonymous

    diff, v13, current

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMay 26th 2023

    added pointer to:

    diff, v14, current

  4. Fix small error.

    diff, v17, current

1 to 4 of 4

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