List of functors notes:

• Comma category
• Functors
• Full and faithful functors
• Representable functor
• Functor category
• Natural transformations between representable functors
• The Yoneda lemma
• Diagonal functor
• Yoneda Functor
• Adjunction
• Inverse image self-adjunction
• Inclusion-forgetful adjunction to a comma category
• Discrete-forgetful-indiscrete adjunction between Top and Set
• Monad
• Free-forgetful adjunction from Grp to Set