Genus 2 Curves Database | Igusa CM Invariants Database | Quartic CM Fields Database |
A quartic CM field field K is represented by invariants $[D,A,B]$, where $K = \mathbf{Q}[x]/(x^4+Ax^2+B)$, and $D$ is the discriminant of the totally real quadratic subfield (hence $A^2-4B = m^2D$ for an integer $m$).
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