On a theorem by Lin and Shinder through the lens of median geometry

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发表日期：

2025年1月16日

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Anthony Genevois,
Anne Lonjou,
Christian Urech

摘要

Recently, Lin and Shinder constructed non-trivial homomorphisms from Cremona groups of rank $>2$ $> 2$ to $\mathbb {Z}$ $Z$ using motivic techniques. In this short note we propose an alternative perspective from median geometry on their theorem.