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单词 ValueOfDirichletEtaFunctionAtS2
释义

value of Dirichlet eta function at s=2


The value

η(2)=1-122+132-142+-

of the Dirichlet eta functionMathworldPlanetmath can be found by using the Fourier cosine seriesMathworldPlanetmath of the functionMathworldPlanetmathxx-x2on the interval  [0, 1]:

x-x2=16-1π2n=1cos2nπxn2for  0x1(1)

Substituting  x:=12  to the equation (1) yields

14=16-1π2n=1cosnπn2=16+1π2n=1(-1)n+1n2,

which we can solve to the form

η(2)=n=1(-1)n+1n2=π212.(2)

This result could be obtained very simply by using the functional equation connecting Dirichlet eta function to Riemann zeta functionDlmfDlmfMathworldPlanetmath.

Combining the equation (2) with the result concerning the Riemann zeta function at 2 (http://planetmath.org/ValueOfTheRiemannZetaFunctionAtS2) shows that

1+132+152+172+=π28.(3)
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更新时间:2025/5/4 4:09:24