[pumanoir]

which books will teach how to build your own computer algebra system? (I've only heard PAIP does)

[emmanueloga_]

I feel building your own is probably not the best way to benefit from a CAS, unless you are doing it for fun! But I had this question too in the past and found some resources, including the fact that SymPy is a good project to learn from.

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https://www.sympy.org/en/index.html

https://www.google.com/books/edition/Computer_Algebra/rOU3EA...

http://sarabander.github.io/sicp/html/2_002e3.xhtml#g_t2_002...