Thanks to Mario Cortina Borja, Tim M, Katie Pike, Gianluca Fusai and Michel
Grzebyk for the useful suggestions about the solution of the integral ln(1 +
exp(ax)) dx.
Yes, the analytical expression can be expressed only in terms of the
polylogarithnm function.
The site integrals.wolfram.com is extremely useful.
thank you again
Stefano
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