# vim: set fileencoding=utf-8 :
- Last possibilities reduce to a similar result.

- ExpressionNode.equals() werkend maken voor alle cases (negatie).

- Create unit tests for node inequivalence operator.

- Line printer: 1 / (n + n)x  ->  1 / (n + n) * x

- Modules:
  + Equations with substitution
  + Gonio, no matches for sin(pi), sin(2pi), sin(4pi), etc...

- Fix: int -cf(x) dx (caused infinite loop)
  Solution: remove baby steps that rewrites f(x) to f(x) ^ 1

- Add backslash notation for special LaTeX symbols notation such as \pi?

- Change integral representation in parser so that _ and ^ bounds are printed correctly by line printer.

- Rewrite unit tests to use improved line printer syntax.
- Add notation "1 1/3" for 'int with fraction' leafs, and rules to rewrite them to fractions and back.