Existence and boundedness of n-complements

Let X/ZoX/Z\ni o be a pair as in the cited theorems, with special fibre XoX_o, and let (X/Zo,B+P)(X/Z\ni o,B+\mathcal P) be an Alexeev pair of index mm when applicable. The condition that X/ZoX/Z\ni o has wFt means that it has weakly finite type in the sense used in the paper.

Existence and boundedness of nn-complements conjecture. The cited theorems should hold without assuming that X/ZoX/Z\ni o has wFt. The connectedness assumption on XoX_o may instead be replaced by a bound on the number of connected components of XoX_o. The same is expected for Alexeev pairs of index mm.

The conjecture is stated as an extension of the paper's existence and boundedness results for complements. It is open in the generality asserted here; the source notes that the conjecture holds in dimension at most 22.

Sources & referencesView supporting material

Primary source

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

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