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Jun 25, 2021 at 19:28 comment added Moritz Firsching Wow! That's just great.
Jun 25, 2021 at 18:49 comment added esg @Moritz Firsching: I have now found the exact value of $\operatorname{exp\_abs}(3)$ via an amazing result of Borwein and co-workers, please see above.
Jun 25, 2021 at 18:45 history edited esg CC BY-SA 4.0
typo corrected
Jun 25, 2021 at 17:13 history edited esg CC BY-SA 4.0
Added part on exact value
Jun 24, 2021 at 7:38 comment added Moritz Firsching That's cool! Is there a fast way of calculating more digits here? I tried a bit, but only found $2.71808124147..$. I guess one could only integrate over $[0,1]$ for the first integral and then multiply by $2$, because of symmetry. When only integrating over positive orthant $[0, 1]^3$, one can solve it symbolically to get $\frac{pi^2}{16}$, for orthants with mixed signs it seems to be more challenging to solve it symbolically.
Jun 22, 2021 at 16:55 history answered esg CC BY-SA 4.0