1 strictification issues .... ??? and so forth... ??maybe something about todd's proof??...
2 the universal property... ?? ... serre... serre subcategory ... serre ideal subcategory... ??as maybe wrong idea?? ... limits not involved in the doctrine... ??... ??inversion of morphisms ... quotient vs sub ... and so forth... ???grothendieck topology?? ....
3 other universal properties (but same doctrine...) ...
4 ??other doctrines?? ... abelian categories, toposes, ringed toposes .... ???various versions of "tensor category" ... ???something about chain complexes and so forth...
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