代数幾何学セミナー

過去の記録 ~07/21次回の予定今後の予定 07/22~

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 

今後の予定

2025年07月25日(金)

13:30-15:00   数理科学研究科棟(駒場) 118号室
金光秋博 氏 (東京都立大学)
Quintic del Pezzo threefolds in positive and mixed characteristic
[ 講演概要 ]
We will show that, over any base scheme, (families of) quintic del Pezzo threefolds V5 are classified by non-degenerate ternary symmetric bilinear forms.
As applications, we will discuss (1) the geometry of quintic del Pezzo threefolds in positive characteristic, especially in characteristic two, and (2) finiteness results of V5 over number fields/rings of integers.
(Based on joint work with Tetsushi Ito, Teppei Takamatsu, Yuuji Tanaka)