时间：2019年9月18日（周三）11:00—12:00
地点：南楼202
报告人：Luc Illusie (Université Paris-Sud)
题目：Old and new on the de Rham-Witt complex III. Liftings mod $p^2$ and the Nygaard filtration I
摘要：
I will discuss some open problems arising from this new approach. In the second part, I will revisit liftings mod $p^2$ and decompositions of de Rham complexes ("Deligne-Illusie") in relation with a certain filtration on the de Rham-Witt complex.