Shokurov's toric equality conjecture for log canonical pairs
Let be a normal -factorial algebraic variety with a -boundary divisor , where and the are prime Weil divisors. Assume that is nef and that the pair is log canonical. Shokurov's toric equality conjecture. The estimate
holds. Moreover, equality is achieved if and only if is toric, meaning that is toric and is its boundary. This gives a numerical criterion for recognizing toric varieties among log canonical pairs, but the supplied text does not state whether the claim has been resolved.
References
Primary source
Ilya Karzhemanov, “On one stable birational invariant”, arXiv:1307.5605 (2013).
Additional references
3 papers in this index state this conjecture (1999–2013). The statement above is taken from the most recent of them; the others are arXiv:math/0211336, arXiv:math/9912111.
Progress summary
Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.
Solutions 0
No solutions have been posted yet.