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arxiv: 1805.08581 · v3 · pith:WC75KYYLnew · submitted 2018-05-22 · 🧮 math.AG

VGIT presentation of the second flip of overline{M}_(2,1)

classification 🧮 math.AG
keywords curvesflipgenuspointedpresentationsecondvgitanalysis
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We perform a variation of geometric invariant theory stability analysis for 2nd Hilbert points of bi-log-canonically embedded pointed curves of genus two. As a result, we give a GIT construction of the last three non-trivial log canonical models of the moduli space of pointed genus two curves, and obtain a VGIT presentation of the second flip in its Hassett-Keel program.

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