Very frequent question is "How category theory can help other mathematical areas?". I want to reverse it and ask: are there results in CT which can be obtained more easily by using methods from other mathematical subjects? Are such things as, say, combinatorial CT possible?

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    $\begingroup$ ?ncatlab.org/nlab/show/… $\endgroup$
    – user451844
    Aug 10, 2017 at 20:20
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    $\begingroup$ For example the diagram chasing lemmas for Abelian categories can be obtained more easily for modules with flesh-and-blood elements, and then one can involve Mitchell's embedding theorem.. $\endgroup$
    – Berci
    Aug 10, 2017 at 20:58
  • $\begingroup$ Combinatorial category theory : maths.ed.ac.uk/~tl/whitepoint/euler.pdf (by Tom Leinster, this is about the Euler characteristic of a category) $\endgroup$ May 4, 2018 at 10:09
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    $\begingroup$ What do you mean by combinatorial category theory? $\endgroup$ May 4, 2018 at 15:12


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