Wed, Apr 30, 2014 I hope most mathematicians continue to fear and despise category theory, so I can continue to maintain a certain advantage over them. —John Baez The above is a graph of the number of times the phrase “category theory” has been used in books, from about 1950 through the present. It speaks for itself. But why? What’s the big deal? Why does category theory matter? I’m about a quarte