Time: Thursday, November 24, from 4:30pm to 6:30pm (Hanoi time)

Abstract: In this talk, I will review a paper by Ramis-Sauloy which is mainly about the local analytic classification of q-difference modules in the style of Riemann-Hilbert correspondence. Because our main interest is the case of formal connections, I will try to explain in more detail how to use Picard-Vessiot theory in describing the (big and small) tannakian fundamental groups of the category of formal connections.

If time permits, I will discuss a little bit about q-difference modules.

Online Google meet link: https://meet.google.com/yep-kbzk-eao?pli=1&authuser=1

Seminar website: http://math.ac.vn/en/hinh-hoc-dai-so/month.calendar/2022/10/23/-.html