On Sat, Jun 4, 2011 at 12:49 AM, Aaron Meurer <asmeu...@gmail.com> wrote:
> I don't understand. How is ∂x/∂t != dx/dt?
Sorry, I thought about one thing and wrote another. I was thinking
something like L(v, x, t) = v**2/2 - x**2/2, then take dL/dt = v *
v'(t) + x * x'(t), but ∂L/∂t = 0. I know one should explicit in a
partial derivative which other variables are to be held constant, but
this "convention" was used when I took classes on mechanics, and it
really make things shorter to write -- and anyway, how woud you write
(∂L/∂t)_{v, x} in sympy?
Renato
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