If I do
import sympy
k, V, Vprime = sympy.symbols('k, V, Vprime')
print sympy.diff(k + V(t), t)
I get Derivative(V(t), t) as I expect - the derivative distributes and the
constant term has zero derivative.
However, if I construct an equivalent expression via substitution, simplify
does
not distribute the derivative. How can I get the same result via
substitution as when I evaluate the expression directly?
sympy.diff(Vprime(t)).subs({Vprime(t): k + V(t)}).simplify()
returns Derivative(k + V(t), t).
(also posted on Stackoverflow
<http://stackoverflow.com/questions/32087945/distribute-derivative-of-sum-with-constant-term-after-substitution>
)
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