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I am following Abstract Algebra an Interactive Approach by William Paulsen but some of the functions in the first chapter itself, like ShowTerry(), ItitTerry(), MultTable() etc are giving NameError. Same is the case with most of the functions in the preliminaries chapter like ShowRationals(), PowerMod()
I'm not really sure how to go about it. I even tried installing sage from Source Code but the problem persists. Do I have to install some separate group theory package or am I missing something here?