Integral(1/t * e^(t- 1/t))

Hello, I have problems to show that

If one omits the constants then essentially on has to calculate

.

I can't see, if and how substitution or partial integration could help.

Maybe the residual theorem could help? But I dont see directly how...

Do you have an idea how to calculate this integral? I would be glad, if somebody has.

best regards,

slabic

Re: Integral(1/t * e^(t- 1/t))

Hello,

It looks like something from probability... Is it the original problem ?

Re: Integral(1/t * e^(t- 1/t))

yes, the background is a prove of a specific semigroup-representation. This topic can be connected to markov-transition kernels.

To prove this representation, the only step left, is the problem above.

But I think I'm on a good way with completing the exponent to a square and after substitution one gets an expression which is almost the gammafunction.