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  1. Section “Necessity of naturality” sounded like there is nothing interesting going on if we look at the unnatural isomorphism of hom-sets. But this isn’t the case, already in the 60s a graph-theoretical and purely categorical facts of this form have been established. I’m adding the two earliest references.

    Tomas Jakl

    diff, v72, current

    • CommentRowNumber102.
    • CommentAuthorUrs
    • CommentTimeJun 18th 2021
    • (edited Jun 18th 2021)

    The entry fell short of really citing the following in full, so I have added it now:

    diff, v73, current

  2. adding text from HoTT wiki.

    Anonymous

    diff, v76, current

    • CommentRowNumber104.
    • CommentAuthorUrs
    • CommentTimeJun 7th 2022

    This edit needs analogous adjustments to those pointed out in another thread here.

    I am out of energy for the moment. Please look into it. Generally, please try to keep in mind that nLab entries need to retain a minimum of logical consistency as you drop material into them that is copied from elsewhere.

    diff, v77, current