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Globally +-regular varieties and the minimal model program for threefolds in mixed characteristic

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arxiv 2012.15801 v3 pith:YVOPAE2P submitted 2020-12-31 math.AG math.ACmath.NT

classification math.AGmath.ACmath.NT
keywords characteristicmixedgeneralizeminimalmodelprogramthreefoldsadjoint
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abstract

We establish the Minimal Model Program for arithmetic threefolds whose residue characteristics are greater than five. In doing this, we generalize the theory of global $F$-regularity to mixed characteristic and identify certain stable sections of adjoint line bundles. Finally, by passing to graded rings, we generalize a special case of Fujita's conjecture to mixed characteristic.

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  1. Some terminal orders on 3-folds

    math.AG 2026-07 accept novelty 7.0 of 10

    First non-trivial terminal local orders in dimension three are constructed as maximal orders with toric ramification data and as deformed symbols ramified on Kleinian singularities.

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