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Genus–degree formula
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Genus–degree formula : ウィキペディア英語版
Genus–degree formula
In classical algebraic geometry, the genus–degree formula relates the degree ''d'' of an irreducible plane curve C\subset\mathbb^2 with its arithmetic genus ''g'' via the formula:
: g=\frac12 (d-1)(d-2) . \,
If the curve is non-singular the geometric genus and the arithmetic genus are equal, but if the curve is singular, with only ordinary singularities, the geometric genus is smaller. More precisely, an ordinary singularity of multiplicity ''r'' decreases the genus by \scriptstyle \frac12 r(r-1).〔Semple and Roth, ''Introduction to Algebraic Geometry'', Oxford University Press (repr.1985) ISBN 0-19-853363-2. Pp. 53–54〕
== Proof ==
The proof follows immediately from the adjunction formula. For a classical proof see the book of Arbarello, Cornalba, Griffiths and Harris.

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