> This is done in order to have "x" as a default predefined symbolic
> variable. However, the whole file "sage/calculus/predefined.py" is executed
> which calls "SR.var()" on every single letter of the alphabet (lowercase
> and uppercase). So, when one has a freshly started Sage session (without
> any additional execution), "SR.symbols" already has length 48:
>
> SR.symbols = {'a':a, ...'z':z, 'A':A, ...,'Z':Z}
>
>
> I wonder if that is a remnant from the short period of time where Sage
did predefine all those letters as symbolic variables. (Several
competitors have different approaches to this; the compromise that lasted
for us - in my view, correctly - was to only predefine x.) I'd be
interested in any other archaeology around that, otherwise it seems that
this could be shortened, as you say. Variables like phi are more likely
than e, for instance. I assume that this SR does not clobber the
predefined constant e, for instance.
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