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These are questions asked by Fay

Under what if any conditions is it permissible to take the limit through/under the integral sign? For example the following maple commands

> assume(t > 0)

> limit(int(f(t)*exp(s*t),t = 0..infinity),s = infinity)


seems to imply that this really is a permssible operation.




I need to integrate a function from either 0- or 0+ to infinity. While there is no problem entering the upper limit, how is it possible to enter either of the lower limits?
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