-
18A05
Definitions, generalizations
-
18A10
Graphs, diagram schemes, precategories [See especially
20L05]
-
18A15
Foundations, relations to logic and deductive systems [See also
03-XX]
-
18A20
Epimorphisms, monomorphisms, special classes of morphisms, null morphisms
-
18A22
Special properties of functors (faithful, full, etc.)
-
18A23
Natural morphisms, dinatural morphisms
-
18A25
Functor categories, comma categories
-
18A30
Limits and colimits (products, sums, directed limits, pushouts, fiber products, equalizers, kernels, ends and coends, etc.)
-
18A32
Factorization of morphisms, substructures, quotient structures, congruences, amalgams
-
18A35
Categories admitting limits (complete categories), functors preserving limits, completions
-
18A40
Adjoint functors (universal constructions, reflective subcategories, Kan extensions, etc.)
-
18A99
None of the above, but in this section
