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 Math for the people, by the people.
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18Axx - General theory of categories and functors

18A05 - Definitions, generalizations - 49 items
18A10 - Graphs, diagram schemes, precategories - 5 items
18A15 - Foundations, relations to logic and deductive systems - 18 items
18A20 - Epimorphisms, monomorphisms, special classes of morphisms, null morphisms - 11 items
18A22 - Special properties of functors (faithful, full, etc.) - 6 items
18A25 - Functor categories, comma categories - 18 items
18A30 - Limits and colimits (products, sums, directed limits, pushouts, fiber products, equalizers, kernels, ends and coends, etc.) - 22 items
18A35 - Categories admitting limits (complete categories), functors preserving limits, completions - 2 items
18A40 - Adjoint functors (universal constructions, reflective subcategories, Kan extensions, etc.) - 20 items
18A99 - Miscellaneous - 3 items

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