Monday, August 24, 2015

calculus - Is there an integral for frac1zeta(3)?

There are many integral representations for ζ(3)



Some lesser known are for instance :



10x(1x)sinπxdx=7ζ(3)π3



10li(x)3 (x1)x3dx=ζ(3)4



π0x(πx)csc(x) dx=7 ζ(3)




0tanh2(x)x2dx=14 ζ(3)π2



π20xlogtanxdx=78ζ(3)



ζ(2) also has many integral representations as does 1ζ(2) , although this probability is because 1π and 1π2 have many.
Well I suspect that because I know no simple integral expression for 1ζ(3).



My question is: is there some interesting integral whose result is simply 1ζ(3)?




Note



Interesting integral means that things like



+0eζ(3) x dx=1ζ(3)



are not a good answer to my question.

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