Shokurov's boundary property

Details Shokurov's boundary property Shokurov's boundary property

2002-10-17

arxiv.org/abs/math/0210271v1

Mathematics

Algebraic Geometry

LaTex, 26 pages

Scientific paper

For a birational analogue of minimal elliptic surfaces X/Y, the singularities of the fibers define a log structure in codimension one on Y. Via base change, we have a log structure in codimension one on Y', for any birational model Y' of Y. We show that these codimension one log structures glue to a unique log structure, defined on some birational model of Y (Shokurov's BP Conjecture). We have three applications: inverse of adjunction for the above mentioned fiber spaces, the invariance of Shokurov's FGA-algebras under restriction to exceptional lc centers, and a remark on the moduli part of parabolic fiber spaces.

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