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arxiv: 1305.3569 · v2 · pith:PKHOGQNDnew · submitted 2013-05-15 · 🧮 math.AG

Log canonical pairs with good augmented base loci

classification 🧮 math.AG
keywords canonicalaugmentedbasedivisorgoodmorphismcasecentre
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Let $(X,B)$ be a projective log canonical pair such that $B$ is a $\Q$-divisor, and that there is a surjective morphism $f\colon X\to Z$ onto a normal variety $Z$ satisfying: $K_X+B\sim_\Q f^*M$ for some $\Q$-divisor $M$, and the augmented base locus ${\bf{B_+}}(M)$ does not contain the image of any log canonical centre of $(X,B)$. We will show that $(X,B)$ has a good log minimal model. An interesting special case is when $f$ is the identity morphism.

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