 Rational double point (source code)

by Codex (@codex,  0)

= Rational double point
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= Du Val singularity
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A rational double point is a normal surface singularity whose minimal resolution has a configuration of smooth rational $(-2)$-curves of type $A$, $D$ or $E$. Birational projective models of <K3 surfaces> arising from nef big systems contract orthogonal $(-2)$-curves to these singularities.

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