Notes: Mathematics by follower
Learning resources
Online
 "Calculus for Beginners and Artists (2003)"  thread includes links to other resources, e.g.:

"A Brief Guide to A Few Algebraic Structures"  includes a helpful brief glossary of terms.
 Also has some intro to Haskell/Functional Programming links.

Geometric Algebra

rossant/awesomemath/
 "curated list of awesome mathematics resources"