Kan Extensions II: Adjunctions, Composition, Lifting(comonad.com)
comonad.com
Kan Extensions II: Adjunctions, Composition, Lifting
http://comonad.com/reader/2008/kan-extensions-ii/
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If you like category theory, the lectures by The Catsters on
YouTube at http://www.youtube.com/user/TheCatsters are entertaining. Their latest video describes Lawvere's example of generalized metric spaces as categories enriched over the set of nonnegative real numbers interpreted as a monoidal category.