a-n-complements conjecture

Let aa be a nonnegative real number. An aa-lc over oo R\mathbb R-complement of (X/Zo,B)(X/Z\ni o,B) is assumed in the cited complement theorems. An aa-nn-complement is an nn-complement (X/Z,B+)(X/Z,B^+) such that (X,B+)(X,B^+) is aa-lc over oo.

aa-nn-complements conjecture. Under the additional assumption that (X/Zo,B)(X/Z\ni o,B) has an aa-lc over oo R\mathbb R-complement, the cited complement theorems should yield an aa-nn-complement (X/Z,B+)(X/Z,B^+) with nNn\in\mathcal N. The set of complementary indices N\mathcal N may depend on aa; restrictions on complementary indices are expected to hold for II, but not for approximations when aa is irrational. The same is expected for Alexeev pairs of index mm.

This is an aa-lc strengthening of the existence and boundedness theory for complements. It remains open in the generality stated, and the source notes that the dependence on irrational aa requires weaker conclusions for approximations.

Sources & referencesView supporting material

Primary source

V. V. Shokurov, “Existence and boundedness of n-complements”, arXiv:2012.06495 (2020).

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