[Maxima] 'at' simplification

[Richard Fateman]

On 4/8/2012 11:58 AM, nijso beishuizen wrote:
> Dear all,
>
> This:
>
> at(diff(g(x),x),[y=1]) - at(diff(g(x),x),[y=0])
>
> should result in 0. Is there a (built-in) way to achieve this?
no, because if g(x):=x*y
it is false.

> I would expect that 'at' (or some simplification function) would 
> recognize that the expression is independent of y.
>
>
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