zetafunction
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HARMONIC series is divergent, but REGULARIZABLE
[tex]\sum_{n=1}^{\infty} \frac{1}{n} = - \frac{\Gamma '(1)}{\Gamma(1)}[/tex]
the idea is that Harmonic series is the logarithmic derivative (a=1) of the infinite product
[tex]\prod (n+a)[/tex] which can be 'regularized' to give [tex]e^{ - \zeta ' _{H} (0,a)[/tex]
here the Zeta function is the Hurwitz one , the above is the definition of zeta-regularized determinat
[tex]\sum_{n=1}^{\infty} \frac{1}{n} = - \frac{\Gamma '(1)}{\Gamma(1)}[/tex]
the idea is that Harmonic series is the logarithmic derivative (a=1) of the infinite product
[tex]\prod (n+a)[/tex] which can be 'regularized' to give [tex]e^{ - \zeta ' _{H} (0,a)[/tex]
here the Zeta function is the Hurwitz one , the above is the definition of zeta-regularized determinat