## Interactive Web Stuff

Lots of good examples linked from: <https://distill.pub/2020/communicating-with-interactive-articles/>

Eg, "econ graphs": <http://www.econgraphs.org/>

## mathjs

mathjs.org is a simple expression parser and evaluator. Allows function
definitions in expressions.

Has some very simple intro CAS simplification and derivative descriptions:
<https://mathjs.org/docs/expressions/algebra.html>