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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeMay 5th 2017

    At limits and colimits by example an entry for Kuratowski pair was requested, so I created it. The place where this should really be linked to is the entry ordered pair, so I added a link there. Also, I made that entry mention Cartesian product, which it didn’t.

    • CommentRowNumber2.
    • CommentAuthorTobyBartels
    • CommentTimeMay 8th 2017

    I corrected your definition from {a,{a,b}}\{a, \{a,b\}\} to {{a},{a,b}}\{\{a\}, \{a,b\}\}. The former can be used, but it is trickier (it requires the axiom of foundation to prove the fundamental theorem), and it's not what Kuratoswki used.

    • CommentRowNumber3.
    • CommentAuthorUrs
    • CommentTimeMay 8th 2017

    Oh, okay. Hm, why is that?