String diagrams for functors and natural transformations are introduced, then we show how adjunctions and monads have a very simple and natural description in this language.
About TheCatsters
Videos on various topics in category theory.
A pictorial map of the videos can be found at
http://www.scss.tcd.ie/Edsko.de.Vries/ct/catsters/
These are probably best viewed in full-screen mode.
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