Hi Jason,

> So until hit with an explicit simplify command, symbolic expressions
> seem retain at least some information about how they were input.  Is
> there a way to get the input form of an expression back out?  Can I
> ever get sage to print something like
>
> sage: (x - x).some_devious_trick()
> x - x

Not quite so devious:

sage: a = x - x
sage: a._operator
<built-in function sub>
sage: a._operands
[x, x]

--Mike

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