When I teach, I frequently write supplementary notes for my students. Some notes which have appeared to be particularly effective are listed here.
- An Intuitive Introduction to Calculus
- An Intuitive Overview of Taylor Series
- Series convergence tests with examples
- A first and second supplemental set of notes on the Gaussian integers.
These notes lie a bit outside the typical curriculum.
I've also written expository papers that dive deeper into undergraduate math topics. See more at