Francesco Bonazzi

How deep are you going to describe the submodules? I can provide targeted descriptions of the parts I know well.

We should also mention something about the tensor module, though it's far from complete.

I approve the version and agree to 4.

Substitution appears quite often.

- substitution - preventing expressions from being evaluated - systems of equations - indexed objects

I get _Access Denied_ for the links - https://peerj.com/manuscripts/11410/files/ - https://peerj.com/manuscripts/11410/declarations/ - https://peerj.com/manuscripts/11084/declarations/#question_18 I can access https://peerj.com/manuscripts/11410/ seamlessly. Am I doing something wrong?

> One subject we might consider is using SymPy in teaching. SymPy could be used to turn the student's focus on the subject itself, by skipping tedious calculations.

> I am not sure that there is another major CAS that you can get features into (big or small) without a charge code. Maxima

> Not sure if there is any option to see word diffs on github. That's the point.

- `sympy.tensor.tensor` ==> Schreier Sims algorithm, Butler-Portugal algorithm. - `sympy.diffgeom` ==> Functional differential geometry, Jack Wisdom & Gerald Jay Sussman