lutusp wrote:
> I'm aware there has been some discussion of this issue in the past,
> but I would like to renew it. I understand that canonical DE notation
> isn't on everyone's short list of high priorities, but I think
> students and those with little Sage exposure would appreciate the
> ability to enter a textbook equation with few changes.
>
> It would be great to see this user entry:
>
> y'(x) + y - 1
>
> Automatically become this Sage syntax:
>
> diff(y,x) + y - 1
>
Mathematica allows the y'(x) syntax (well, there it is y'[x]), which
makes the differential equations nice to write in MMA.
However, I don't think y.diff(x,1) is too extremely different to be
really ugly. Maybe we could even shorten it to:
y.d(x,1)
or
y.d(x,2)
(which sort of resembles \frac{dy}{dx} or \frac{d^2y}{dx^2})
The nice thing about using ".d" or ".diff" is that partial differential
expressions have the same syntax: u.d(x,2) or u.diff(x,2)
Jason
--
Jason Grout
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