Riemann zeta function (Wikipedia)The Riemann zeta function or Euler–Riemann zeta function, denoted by the Greek letter ζ (zeta), is a mathematical function of a complex variable
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“A man could go far, knowing his rights like you do,” said Granny. “But right now he should go home.”Terry Pratchett, Wyrd Sisters
The duke had a mind that ticked like a clock and, like a clock, it regularly went cuckoo.Terry Pratchett, Wyrd Sisters