Calculus

Calculus is the age-old study of infinetesimal rates of change. I write articles here from the perspective of hyperreal numbers instead of using limits because they were the original intuitive way that calculus was invented (and how I originally reinvented the derivative).

You can also browse the groff source files, as well as use, modify, and distribute them to your liking.

Elementary Calculus

Multivariable

Source

These are the groff source files I compile my PDF from. You're free to download, modify, and distribute them freely.