Zeta

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Zeta (upper case Ζ, lower case ζ) is the sixth letter of the Greek alphabet. In the system of Greek numerals it has a value of 7.

The lower-case letter ζ is used as symbol for:

• The Riemann zeta function and other zeta functions in mathematics.
  
• In polymer dynamics, the coefficient of viscous friction.
  
• In astronomy, the sixth brightest (usually) star in a constellation. See Bayer designation.
  
• Letters related to Zeta include the Roman Z.
  
  

See also the film Z.

Greek alphabet
Α α Alpha	Β β Beta	Γ γ Gamma
Δ δ Delta	Ε ε Epsilon	Ζ ζ Zeta
Η η Eta	Θ θ Theta	Ι ι Iota
Κ κ Kappa	Λ λ Lambda	Μ μ Mu
Ν ν Nu	Ξ ξ Xi	Ο ο Omicron
Π π Pi	Ρ ρ Rho	Σ σ Sigma
Τ τ Tau	Υ υ Upsilon	Φ φ Phi
Χ χ Chi	Ψ ψ Psi	Ω ω Omega

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