In mathematics, eta function may refer to:
- The Dirichlet eta function η(s), a Dirichlet series
- The Dedekind eta function η(τ), a modular form
- The eta function η(s) used to define the eta invariant
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“The function of muscle is to pull and not to push, except in the case of the genitals and the tongue.”
—Leonardo Da Vinci (14251519)