English

Fano threefolds in positive characteristic II

Algebraic Geometry 2024-10-03 v5

Abstract

Let XX be a smooth Fano threefold over an algebraically closed field of positive characteristic. Assume that KX|-K_X| is very ample and each of the index and the Picard number is equal to one. We prove that 3g123 \leq g \leq 12 and g11g \neq 11 for the genus gg of XX. Moreover, we show that there exists no smooth curve on XX along which the blowup is Fano.

Keywords

Cite

@article{arxiv.2308.08122,
  title  = {Fano threefolds in positive characteristic II},
  author = {Hiromu Tanaka},
  journal= {arXiv preprint arXiv:2308.08122},
  year   = {2024}
}

Comments

96 pages

R2 v1 2026-06-28T11:56:41.132Z