# 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.
- Chain rule -- Explaining and deriving the chain rule.

## Multivariable

- Partial Derivative -- a fundamental operation regarding mulitvariable calculus.