Some code even seems to rely on that.

Might be a good idea to verify all implementations do this (I am aware of only one implementation outside of GAP itself, namely in the io package).

improve HarmonicNumber implementation:
https://github.com/axkr/symja_android_library/blob/master/symja_android_library/matheclipse-core/src/main/java/org/matheclipse/core/builtin/Arithmetic.java#L1834

• https://en.wikipedia.org/wiki/Harmonic_number
• https://medium.com/cantors-paradise/the-celebrated-harmonic-numbers-and-how-to-approximate-them-b8747a4efeec

I noticed that I forgot to update the API docs for a refactor that moved mathy.mathy to mathy.api.

Currently, you have to run:

cd libraries/website
sh tools/docs.sh

And it generates all the API doc files. This means it's too slow to run all the time. It should be updated to run as part of lint-staged and support passing individual files on the command-line, similar to th

Now that we can generate equations of motion from a Lagrangian (should work in theory for Hamiltonians too but I haven't tried), it'd be really slick if we could pipe that solution into a differential equation solver and get a numerical solution.

@PerezHz works on TaylorIntergration.jl so if he wants to get that running, that'd be great. I'd also like DifferentialEquations.jl support at some p

Improve code quality of Visitor class by removing duplicated code of visitPow, visitMulDuv and visitAddSuv methods.