Actually, the subject of your email now makes a little more sense.
But I don't think that one can define an inverse function quite this
easily!  That would indeed be *very* obscure notation!  I don't know
if we can define a symbolic inverse of this kind yet, or whether that
would even be easy - much less to differentiate it.  Anyone?

- kcrisman

On Sep 18, 6:20 am, alien308 <[email protected]> wrote:
> x = var("x")
> d = function("d",x)
> diff(x, d)
>
> output:
> Traceback (click to the left of this block for traceback)
> ...
> TypeError: argument symb must be a symbol

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