代数幾何学セミナー

過去の記録 ~05/02次回の予定今後の予定 05/03~

開催情報 金曜日 13:30~15:00 数理科学研究科棟(駒場) 118号室
担当者 權業 善範、河上 龍郎 、榎園 誠 

2024年05月24日(金)

13:30-15:00   数理科学研究科棟(駒場) ハイブリッド開催/056号室
佐藤謙太 氏 (九州大学)
Boundedness of weak Fano threefolds with fixed Gorenstein index in positive characteristic
[ 講演概要 ]
In this talk, we give a partial affirmative answer to the BAB conjecture for 3-folds in characteristic p>5. Specifically, we prove that a set of weak Fano 3-folds over an uncountable algebraically closed field is bounded, if each element X satisfies certain conditions regarding the Gorenstein index, a complement and Kodaira type vanishing. In the course of the proof, we also study a uniform lower bound for Seshadri constants of nef and big invertible sheaves on projective 3-folds.