The sixth letter of the modern Greek alphabet (Ζ, ζ) preceded by epsilon (Ε, ε) and followed by eta, (Η, η); or the seventh letter in the ancient Greek alphabet, in which it is preceded by digamma (Ϝ, ϝ)
A mathematical function formally known as the Riemann zeta function. Example: Zeta of 3 is irrational
All clues having "ZETA"
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