Shokurov's weak epsilon-lc complement conjecture

Let (X/PiZ,KX+B)(X/P i Z,K_X+B) be a dd-dimensional b4b4-lc weak \log Fano pair, with coefficients of BB in a DCC set 91b[0,1]91b [0,1]. A complement is an b5b5-lc boundary satisfying the complement index and coefficient inequalities, relative to PZP Z or in codimension 22.

Weak b5b5-lc complement conjecture. For every 0<b40<b4 and dd, there exist a finite set a9b4,d,91ba9_{b4,d,91b} of positive integers and 0<b50<b5 such that every such pair is (b5,n)(b5,n)-complementary over PP (respectively in codimension 22) for some na9_{b4,d,91b.

This is one of Shokurov's boundedness conjectures for complements and concerns uniform complement indices for weak log Fano pairs.

Sources & referencesView supporting material

Primary source

Caucher Birkar, “Boundedness of ε-log Canonical Complements on Surfaces”, arXiv:math/0409254 (2004).

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