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Smoothing cones over K3 surfaces (1601.02381v3)
Published 11 Jan 2016 in math.AG
Abstract: We prove that the affine cone over a general primitively polarised K3 surface of genus g is smoothable if and only if g\le 10 or g=12. We also give several examples of singularities with special behaviour, such as surfaces whose affine cone is smoothable even though the projective cone is not.
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