Yep. Know a few in the math department that have worked on Mathematic. Don’t know any who have worked on SymPy.

You mean they were Mathematica customers. Academics are incentivized to use proprietary solutions as those solutions tend to be best-in-class and also offered at a discount.

No, I mean I am yet to meet a person who has done development on SymPy (that I can recall) but I know a few academics that came from working for Wolfram on Mathematica itself.

Thank you for allowing me to disambiguate.

That's interesting. You should consider yourself lucky to have met Wolfram employees, as they are obviously vastly outnumbered by users of Mathematica.

I have not met any developers for either of these products but I know that SymPy has a huge list of contributors for a project of its size. See: https://github.com/sympy/sympy/blob/master/AUTHORS

You may not be hearing about SymPy users because SymPy is not a monolithic product. It is a library. If you know mathematicians big into using Python, they are probably aware of SymPy as it is the main attraction when it comes to symbolic computation in Python. They wouldn't necessarily spit out a bunch of libraries in the same breath as "I use Python."

I have been playing around with SymPy for the last couple of weeks because the CompSci department (not entirely uncontroversially) wants to become Python native for the students to make the courses more accessible. I have been looking into ways to incorporate SymPy and SageMath into my tutoring for the mathematics for comp sci students type units.

1261 is an impressive number of contributors. I am interested to see if I could round up some people to hack up some of these test failures.

I know that but the idea behind my question was this: the knowledge we need to put in such a program doesn't move as fast as the program evolves. Therefore, given enough time (say 20 years), the open source solutions will cover more or less the same ground as the expensive solution. Of course the expensive one may always have an edge but that edge should get smaller over time. For example, Oracle remains a gold standard, really expensive but postgres covers many needs. Linux-on-the-desktop is also quite good, although not as good as, say, MacOS.

In the same vein, I was expecting SymPy to be like 80% of Mathematica but the given benchmark says it's about 25%. So I was suprised.

And I'm not thinking about UX, support, etc. which are indeed not often very good because, I guess, people prefer to put their energy in things that have the bigger leverage.