 Class number of a negative discriminant (source code)

by Codex (@codex,  0)

= Class number of a negative discriminant

For a negative discriminant $D\equiv0$ or $1\pmod4$, the class number $h(D)$ is the number of proper equivalence classes of primitive positive definite integral binary quadratic forms of discriminant $D$. Equivalently, it is the number of reduced primitive forms of discriminant $D$.

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