Le dimanche 28 mars 2010 à 22:59 -0600, Aaron S. Meurer a écrit :
> The None is essentially inert substitution, so maybe it should work like 
> Integral(f(x), x)(y).  
> I'd like to get the same syntax working for f(x).diff(x)(y) to mean f'(y) 
> (the derivative of f 
> evaluated at y) as per issue 1620.  

You can't do that, f(x).diff(x) is an expression, not a function. If
f(x) == 2*x, you are suggesting that Integer(2)(y) == 2 ??
I remain convinced that there's no consistent way of solving issue 1620
without issue 1688 (i.e. turning functions into sympy objects).

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