The **dual** of a cuspidal modular form $f$ is the form whose coefficients $a_n$ in its $q$-expansion are the complex conjugates of those of $f$. The L-function of the dual form is the dual of the L-function of $f$.

The coefficient field of a non-self-dual newform is a CM field.

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- Review status: reviewed
- Last edited by Andrew Sutherland on 2019-03-13 18:40:12

**History:**(expand/hide all)

- 2023-07-11 11:45:08 by John Jones
- 2019-03-13 18:40:12 by Andrew Sutherland (Reviewed)
- 2019-02-26 11:44:38 by David Roe

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