The log abundance conjecture for projective lc pairs

Let (X,B)(X,B) be a projective lc pair. The divisor KX+BK_X+B is assumed to be pseudo-effective, meaning that its numerical class lies in the closure of the cone generated by effective divisors. Log abundance conjecture. If KX+BK_X+B is pseudo-effective, then (X,B)(X,B) has a good minimal model.

This is the log-pair form of abundance and concerns the existence of a minimal model whose log canonical divisor is semiample. The supplied text does not state a resolution of this conjecture in general.

Sources & referencesView supporting material

Primary source

Jihao Liu and Zheng Xu, “Non-vanishing implies numerical dimension one abundance”, arXiv:2505.05250 (2025).

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