Apéry's constant

English

Etymology

Named after French mathematician Roger Apéry who proved in 1978 that it is an irrational number.

Proper noun

Apéry's constant

1. (mathematics) The number $\zeta (3)=\sum _{n=1}^{\infty }{\frac {1}{n^{3}}}$, where ζ is the Riemann zeta function, with a value of approximately 1.2020569…