Catalan's constant

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English

Etymology

Named after French and Belgian mathematician Eugène Charles Catalan.

Proper noun

Catalan 's constant

English Wikipedia has an article on:

Catalan's constant

(mathematics) The number $G=\beta (2)=\sum _{n=0}^{\infty }{\frac {(-1)^{n}}{(2n+1)^{2}}}={\frac {1}{1^{2}}}-{\frac {1}{3^{2}}}+{\frac {1}{5^{2}}}-{\frac {1}{7^{2}}}+{\frac {1}{9^{2}}}-\cdots$ , where $β$ is the Dirichlet beta function, with a value of approximately 0.915965594177…

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