In SymPy if you want to express a relationship between symbols, you
have to use functions, like
f = Function('f')
f(x, y)
creates something that depends on x and y. It is possible to do this
without the explicit syntax, but that requires writing your own class
with the appropriate methods that tell things like diff that it
depends on given variables (in particular, you need to override
free_symbols).
Aaron Meurer
On Tue, Apr 22, 2014 at 11:15 AM, Peter Eastman <[email protected]> wrote:
> This isn't really about derivatives. It's simply the idea that not every
> symbol is an independent variable. Some of them are defined in terms of
> other symbols, and you can use those definitions in everything you do.
>
> I don't know how/if any other program handles this. I just assumed any CAS
> would do it, since it's so basic to the way humans do mathematics. But
> maybe it's harder than I thought.
>
> Peter
>
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