If f(x, t) is continuous for all x >= a and t \in [alpha, beta] and phi(x) bounded and integrable phi(x), [a, epsilon] for all epsilon >= a , then integrate \{integrate f(x, t) * phi(x) dx from a to ∞\} dx from a to beta = integrate f(x, t) * phi(x) dt from a to ∞ * dx .
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