Existence of log canonical flips and a special LMMP

preprint2012arXivOpen access

Abstract

Let (X/Z,B+A)(X/Z,B+A) be a $\Q$-factorial dlt pair where B,A≥0B,A\ge 0 are $\Q$-divisors and $K_X+B+A\sim_\Q 0/Z$. We prove that any LMMP/Z/Z on KX+BK_X+B with scaling of an ample/Z/Z divisor terminates with a good log minimal model or a Mori fibre space. We show that a more general statement follows from the ACC for lc thresholds. An immediate corollary of these results is that log flips exist for log canonical pairs.

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