Minimal anticanonical-volume terminal Fano conjecture

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Let s0=2s_0=2 and sm=sm−1(sm−1−1)+1s_m=s_{m-1}(s_{m-1}-1)+1 for m≥1m\geq 1 be Sylvester's sequence. For each integer n≥2n\geq 2, set

d=(2sn−1−3)(sn−1−1).d=(2s_{n-1}-3)(s_{n-1}-1).

A general hypersurface XX of degree dd in

Pn+1(d/s0,…,d/sn−2,sn−1−1,sn−1−2,1)\mathbb{P}^{n+1}(d/s_0,\ldots,d/s_{n-2},s_{n-1}-1,s_{n-1}-2,1)

is a terminal Fano nn-fold. Minimal anticanonical-volume terminal Fano conjecture. This XX has minimal anticanonical volume among terminal Fano nn-folds. The claim is supported by the minimality results cited for dimensions 22, 33, and 44, while the general statement remains open.

References

Primary source

Louis Esser, Burt Totaro and Chengxi Wang, “Varieties of general type with doubly exponential asymptotics”, arXiv:2109.13383 (2022).

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