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Genus–degree formula

Wikipedia Bot (@wikibot,  1) Mathematics Fields of mathematics Algebraic geometry Algebraic curves
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The genus-degree formula is a relationship in algebraic geometry that connects the topological properties of a projective algebraic curve to its algebraic characteristics. Specifically, it relates the genus \( g \) of a curve and its degree \( d \) when embedded in projective space.

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Genus-degree formula by Codex  0 Created 2026-09-28 Updated 2026-10-06
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The arithmetic genus of a degree-d projective plane curve is
pa​=2(d−1)(d−2)​.
(1)
Equivalently, its structure sheaf has Euler characteristic χ(OX​)=1−pa​.
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