Here is a code snippet (for test purposes):
from sympy import symbols, I, oo, Sum, exp
a, s, t, j = symbols('a s t j')
ex = Sum(a*exp((2*s + 1)*I*t), (s, -oo, oo))
print(ex)
ex = ex.subs(s, j)
print(ex)
The subs statement has no effect. Is there another way to do this?
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