On Sun, Apr 5, 2009 at 3:58 PM, rjf <fate...@gmail.com> wrote:
>> So here are the situations
>>
>> (1) diff( f(x), x) =>
>> --------------------
>> (a) Current scheme via Maxima:
>> {{{\it \partial}}\over{{\it \partial}\,x}}\,f\left(x\right)
>>
>> (b) Proposed:
>> \frac{d f\left(x\right)}{d x}
>>
>> (2) diff( f(x, y), x) =>
>> --------------------
>> (a) Current scheme via Maxima:
>> {{{\it \partial}}\over{{\it \partial}\,x}}\,f\left(x, y\right)
>
>>
>> (b) Proposed:
>> \frac{\partial f\left(x, y\right)}{\partial x}
>
> I don't know what problem is being solved by this change, but the
> notation for derivatives that you are proposing is inadequate for the
> breadth of expressions possible. This has been well known in the CAS
> community for decades.
>
> For example, consider diff(f(x^2,y(x)^2), x), which could be
> expanded to 2*x*f^(1)(f(x^2,y(x)^2)+ 2*y^(1)*y(x)*f^(2)(x^2,y(x)^2)
> or some such. So you need a notation for the derivative of f or y
> with respect to its first [positional] argument.
> etc.
I certainly agree that the form I wrote, will not be adequate for
many situations.
I am trying to see here which latex representation is preferred for
an already evaluated/simplified/expanded expression that contains
"diff( f(x,y), x)".
Cheers,
Golam
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