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Thanks all comments. hope that the following is more clear.

Suppose that X is nonnegative continuous random variable with
probability density function f_X(x).
Now, we have

A = Integral ( InverseLaplace(g(s)) f_X(x), 0, INFINITE)

where Integral( ..., 0, INFINITE) represents the integral from zero to
positive infinite. InverseLaplace(g(s)) represents the inverse
laplace of g(s). We can denote that 

G(x) = InverseLaplace(g(s)).

My question is as follows:
If A is greater(or less) than zero, then what condition should the
function g(s) satisfy, or any requirement for the function g(s)? Thank
you very much for suggetions. Regards.

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