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nLab > Latest Changes: shape modality

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  1.  
    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeJul 7th 2022

    started a section Preservation of some homotopy fiber products spelling out how the shape modality does not preserve all homotopy fiber products but does preserve the two special cases of (a) looping of delooped objects and (b) of homotopy fiber products over cohesively discrete objects.

    Next I’ll add a little new statement, resulting from the combination of these two and the “reverse pasting law”.

    diff, v29, current

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeJul 7th 2022

    added statement and proof (here) that the shape modality preserves homotopy fibers of discrete over delooped objects.

    diff, v29, current

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeJul 7th 2022
    • (edited Jul 7th 2022)

    I have added (here) discussion of a key technical result from traditional equivariant principal bundle theory, recast as a condition of the shape modality commuting with looping when applied to mapping stacks between deloopings of certain topological groups.

    (This discussion might also and maybe better go elsewhere, such as at nearby homomorphisms from compact Lie groups are conjugate. Maybe I’ll put the section into an !include file in order to conveniently have it in both places. )

    diff, v31, current

1 to 3 of 3

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