> I am mildly in favor of dropping this predefinition (FWIW). > > > Far be it for me to acquire the usual "hobgoblin of little minds" trope, but in this case consistency is probably good. This argument was had ~10 years ago in great detail, with several hilarious variants implemented one after another. This has been pretty stable as a reasonable compromise between usability for bored students and the technical needs of the development crew, and I think one of the very nice things about Sage is that for all the learning curve, at least you can "just do math" with it. Sage cell would not be nearly as useful as Wolfram Alpha without predefined x, for instance.
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