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 literature, through all its mutations, has been to make us aware of the particularity of selves, and the high authority of the self in its quarrel with its society and its culture. Literature is in that sense subversive.”
—Lionel Trilling (1905–1975)