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Categories

June 27, 2012
  1. Category of sets ( . )
  2. Category of involutions (aa = 1)
  3. Category of idempotents (aa = a)
  4. Category of automorphisms (ab = 1, ba = 1)
  5. Category of endomaps (codomain = domain)
  6. Category of isomorphisms (ab = 1, ba = 1’)
  7. Category of maps ( –> )
  8. Category of irreflexive directed multi-graphs ( . –> )
  9. Category of reflexive graphs (ab = 1, ac = 1)
  10. Category of categories ( . –> )
  11.  Category of commutative triangles (a = bc)
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From → Note to self

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