mathlib

ce7248ab - doc(docs/tutorial/category_theory): introductory category theory tutorial (#2104)

doc(docs/tutorial/category_theory): introductory category theory tutorial (#2104) * doc(docs/tutorial/category_theory): Adding WIP beginner category theory docs * linewraps * presumably uncontroversial edits * oops * whitespace * explaining more about universes * warning about definitional associativity * add TODO * Update docs/tutorial/category_theory/category_theory_intro.md * rename * cleanup * adding lean version * various * add a note about debugging universe problems * rename * delete old markdown tutorial * adding sections to make variable names nicer * tidy up universes * url escape parentheses inside links * tweaking text * Update docs/tutorial/category_theory/intro.lean Co-Authored-By: sgouezel <sebastien.gouezel@univ-rennes1.fr> Co-authored-by: Scott Morrison <scott@tqft.net> Co-authored-by: sgouezel <sebastien.gouezel@univ-rennes1.fr> Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>