The function f(x) = g^x can be written as f(x) = g^x = (e^ln(g) )^x = e^ln(g)x . In other words, any exponential function can be written with the Euler’s number e. It is a useful standardisation to make, since exponential functions can be compared more easily that way and the derivative can be computed more easily.
Of course, that means you should also use ln(x), since that’s its inverse function.
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