Problem with chain rule

Michel Talon <talon <at> lpthe.jussieu.fr> writes:

> 
> It seems there is a problem here:
> 
> niobe% maxima
> (%i1) depends(f,[x,y])$
> 
> (%i2) depends(y,x)$
> 
> (%i3) diff(f);
>                         df           df dy   df
> (%o3)                   -- del(y) + (-- -- + --) del(x)
>                         dy           dy dx   dx
> (%i4) 
> 

try:

depends(f, [x,y])$
depends(y,x)$
diff(f,x);

- Michael Xue