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arxiv: math/0406143 · v5 · submitted 2004-06-08 · 🧮 math.AG

Hyperelliptic and trigonal Fano threefolds

classification 🧮 math.AG
keywords fanocanonicalclassifyfoldsgorensteinsingularitiesanticanonicalanticanonically
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We classify Fano 3-folds with canonical Gorenstein singularities whose anticanonical linear system has no base points but does not give an embedding, and we classify anticanonically embedded Fano 3-folds with canonical Gorenstein singularities which are not intersections of quadrics. We also study the rationality questions for most of these varieties.

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