Now, during my entrance exam studies, I saw in the Casella and Berger book a recommendation to learn Mathematica (or something equivalent).
I already program quite well (Python, R, Go, Lisp some C) so no challenge on that side.
I'm somewhat insecure with my algebraic manipulations (takes me a few tries to find the correct way to solve a few problems).
So, I'm wondering if those types of symbolic manipulation software are something I should take some time to learn. I don't know anyone that uses them so I don't have anyone to ask.
If it makes sense, do you guys know of a nice introduction resource I could use?