Generalised abundance conjecture for klt pairs with nef adjoint divisors
Let be a projective klt pair over a field . Assume that is pseudo-effective, and let be a nef -Cartier -divisor on . A divisor is num-semiample if it is numerically equivalent to a semiample -Cartier -divisor.
Generalised abundance conjecture. If is nef, then is num-semiample.
This extends abundance and the semiampleness conjecture to adjoint divisors involving a nef summand. The supplied text gives no resolution of the general statement, so it remains open.
References
Primary source
Fabio Bernasconi and Liam Stigant, “Semiampleness for Calabi–Yau surfaces in positive and mixed characteristic”, arXiv:2207.03002 (2022).
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