Dear Burcin, Tim, Jason, et al. - and sage-support:
This is a new question related to the previous discussion, though it's
not quite the same.
sage: u = function('u')
sage: h,x = var('h,x')
sage: p = diff(u(x+h),h,1)
Okay, so far so good, and in the syntax note that CLEARLY h is the
variable of differentiation.
sage: p.subs(x=0)
D[0](u)(h)
sage: p.subs(h=0)
D[0](u)(x)
I don't see any way to distinguish between these last two guys in
terms of the variable of differentiation, certainly not for the end
user. Shouldn't there be a way to do that? Perhaps this is related
to the as-yet open trac tickets Jason referred to earlier.
Thanks for any clarification and help!
- kcrisman
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