Expositions - Yunhai Xiang

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January 2026

Expander Graphs January 24, 2026
Brauer Groups Part II January 18, 2026

December 2025

Brauer Groups Part I December 19, 2025

November 2025

Learning French Part I November 23, 2025

September 2025

Simplicial Sets and Infinity-Categories September 25, 2025

December 2024

Symmetric Polynomials December 18, 2024

September 2024

Grothendieck-Witt Ring September 12, 2024

February 2024

Uniformization Theorem for Elliptic Curves February 29, 2024
Grothendieck's Proof of van Kampen Theorem February 7, 2024

January 2024

Bundles and Divisors on Schemes January 25, 2024

August 2023

What is This Thing Called Knowledge? August 7, 2023

September 2022

Derived Category September 7, 2022