A related comment:
I like the method name "variables" for symbolic expressions. On the
other hand, I think the name "variable" should be avoided in the exact
polynomial rings cases, as in
sage: P.<x,y>=PolynomialRing(QQ)
sage: P.variable_names()
('x', 'y')
In this case, "gen_names()" is perhaps appropriate and at least
consistent.
Kwankyu
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