I need to solve a problem in sagemath:
P = sum of alpha_m from (K-1) till infinity, where alpha_m = integrate((((lmdt)^m)/factorial(m))b(t)exp(-lmdt), t,0,infinity), lmd is a constant value.
How to feed this in sagemath. I tried to input as: sum((integrate((((lmdt)^m)/factorial(m))b(t)exp(-lmdt), t,0,infinity)), m,K-1,infinity).
It shows error.