Andrzej Weber

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20242026

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math.AG2025

Four paths from birational geometry to the elliptic genus

Andrzej Weber

The article presents four reasons why the elliptic genus is the most general characteristic class that admits a generalization to singular spaces. We prove that the elliptic charac…

math.AG2024

Hecke algebra action on twisted motivic Chern classes and K-theoretic stable envelopes

Jakub Koncki, Andrzej Weber

Let $G$ be a linear semisimple algebraic group and $B$ its Borel subgroup. Let $T \subset B$ be the maximal torus. We study the inductive construction of Bott-Samelson vari…