Talk:Madelung constant
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sech[edit]
what is sech in the converging formula for the Madelung constant of NaCl ? — Preceding unsigned comment added by 37.138.169.178 (talk) 13:57, 25 October 2019 (UTC)
- Sech(x) is the hyperbolic secant of x. 2804:14D:4683:10CD:9184:E581:DE56:E4E (talk) 14:43, 27 November 2023 (UTC)
any example how to use it?