I am a 4th year graduate student in the Mathematics Department at Columbia University, I am interested in arithmetic geometry. My main focus now is on rigid geometry. Here is my CV.

My advisor is Prof. Aise Johan de Jong

My Email: shanbei[at]math[dot]columbia[dot]edu

My name in Chinese characters: 李时璋 (simplified); or 李時璋 (traditional).

Calculus 3, Math S1201, summer 2016. Corresponding website is calc3.

2. English translation of Bartenwerfer's paper *Die erste “metrische” Kohomologiegruppe glatter affinoider Räume*

3. Lemmata in adic-rigid geometry. This is an evolving set of learning notes on adic-rigid geometry.

4. Why are they NOT simply connected? This is the expository notes for a non-trivial étale covering space of rigid projective line.

’Rome wasn’t built in one day, bro…’

1. On rigid varieties with projective reduction, arXiv.

2. Langton’s theorem for multi-filtered vector space, arXiv.

3. No Picard for a rigid \mathbb{A}^1, coming soon.

4. Line bundles on rigid varieties and Hodge symmetry (with David Hansen), arXiv.

(Fall of 2016), Carl and I organized a student algebraic geometry seminar on some cohomology theory in characteristic p discussing Deligne-Illusie and Deligne's famous Weil 2. The website is here.

(Spring of 2017), Carl and I organized a student algebraic geometry seminar on BBD(G). The website is here.

(Spring of 2017), Pak-Hin and I organized a 'title to be determined/naïve' student number theory seminar on the Langlands Program. The main purpose is to eliminate both organizers' iliteracy about it. The website is here.