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
- Derivative -- a fundamental operation regarding calculus.
- Derivative Identities -- Deriving identities related to derivatives of simple functions.
- Derivative Rules -- Deriving common derivative rules.
Multivariable
- Partial Derivative -- a fundamental operation regarding mulitvariable calculus.
Source
These are the groff source files I compile my PDF from. You're free to download, modify, and distribute them freely.