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No it isn't! The function G(x) := Gamma(x) * (1 + c * sin(2 * pi * x)) with 0 < c < 1 is such an example. Both, the Gamma-function and G have the properties f(x+1) = x * f(x) and f(1) = 1. That's why one needs a third property to define the gamma function uniquely.
The moment generating function for any real valued probability distribution is the expected value of e^tX provided that the expectation exists.For the Type I Pareto distribution with tail index a, this isa*[-x(m)t)^a*Gamma[-a, -x(m)t)] for t < 0, where x(m) is the scale parameter and represents the least possible positive value of X.
Convention says that they are quoted as being equal to zero. It makes life FAR easier that way.
I derive that this question needs to be moved.
The noun forms of the verb to derive are deriver, derivation, derivative, and the gerund, deriving.