> This is the only possibility, because the "var('x')" command executed
> by default at startup did the assignment
>
> x = SR('x')
>
> and you haven't bound x to any other object. Once you execute
>
> x = b.0
>
> [ or one of its implicit forms like b.<x>=PolynomialRing(ZZ,'x')] then
> x is no longer referencing the "symbolic expression x", but the
> "univariate polynomial x" instead.

Okay, I knew that this would work, but it seems odd that
PolynomialRing(ZZ, 'x') doesn't actually change x, though it's
consistent.  So it just represents things with x until I ask for the
Python variable x to be that x, not the var x.

Nice to see the positive review for 
http://trac.sagemath.org/sage_trac/ticket/7741
:)  Thanks

- kcrisman

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