Can I query a Derivative to find out with respect to what variables it is a
derivative?
Example:
u, x, y = symbols(('u','x','y'))
f=u(x,y)
d=diff(diff(f,x),y)
print d
Derivative(u(x, y), x, y)
I can find out that d is something that has been differentiated with
respect to x and y, but would like to be able to do so in a
function that receives d and where the only thing known about is that it is
a derivative.
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