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  1. Todd has a “do not tamper” request up on the page at the moment, so I haven’t actually added this (and perhaps Todd intends to add precisely what I am about to say) but I think that the page needs to mention and prove the following remark: that the graph minors of GG are precisely the graphs HH such that there exists a monomorphic functor Π 1HΠ 1G\Pi_1 H\to\Pi_1 G, where Π 1\Pi_1 is the “groupoid of paths” functor.

    • CommentRowNumber2.
    • CommentAuthorTodd_Trimble
    • CommentTimeJun 14th 2017

    I haven’t thought about that. Do you have a proof in mind? Would you like to amplify on “needs to”?

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