Mathematical Sciences Classification System
18Cxx - Categories and theories
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                            18C05
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                            18C10Theories (e.g. algebraic theories), structure, and semantics [See also 03G30]
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                            18C15Triples (= standard construction, monad or triad), algebras for a triple, homology and derived functors for triples [See also 18Gxx]
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                            18C20Algebras and Kleisli categories associated with monads
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                            18C30Sketches and generalizations
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                            18C35Accessible and locally presentable categories
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                            18C50
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                            18C99None of the above, but in this section