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Ultraproduct cohomology and the decomposition theorem

Speaker: Weizhe Zheng (Morningside Center of Mathematics)

Time: 14h00, Friday, April 2, 2021

Join Zoom Meeting:

https://zoom.com.cn/j/4663562952?pwd=MytDVU9tUlg5LzFHNHRHZmFMZ0JaUT09

Session Chair: Prof. Phung Ho Hai (VAST Hanoi)

Abstract: Ultraproducts of étale cohomology provide a large family of Weil cohomology theories for algebraic varieties. Their properties are closely related to questions of l-independence and torsion-freeness of l-adic cohomology. I will present recent progress in ultraproduct cohomology with coefficients, such as the decomposition theorem. This talk is based on joint work with Anna Cadoret.

For general information of the AGEA seminar, please check out

https://sites.google.com/ncts.ntu.edu.tw/agea-seminar

or the mirror site

http://www.math.ntu.edu.tw/~jkchen/agea-seminar.html

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