In mathematics, the Ξ function (named for the Greek letter Ξ or Xi) may refer to:
- Riemann Xi function, a variant of the Riemann zeta function with a simpler functional equation
- Harish-Chandra's Ξ function, a special spherical function on a semisimple Lie group
This article includes a list of related items that share the same name (or similar names).
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