On 5/8/07, Brian Harris <[EMAIL PROTECTED]> wrote:
>
> I don't understand this behavior:
>
> sage: (x^2).diff()
> 2*x
> sage: (xx^2).diff()
> ...
> <type 'exceptions.NameError'>: name 'xx' is not defined
>
> Is the idea that the variable names [a-z] have been predefined for
> convenience, but all others need to be explicitly defined before being
> used?
Yes. To define xx you must write
var('xx')
> Congratulations on the release, by the way!
Thanks. And thanks for the bug reports.
--
William Stein
Associate Professor of Mathematics
University of Washington
http://www.williamstein.org
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