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math.AG2025
Upper Bounds on the Torsion Index of Half-Spin Groups
Sanghoon Baek, Rostislav Devyatov
The torsion index of split simple groups has been extensively studied, notably by Totaro, who calculated the torsion indexes of the spin groups and in [5] and [6], respecti…
math.AG2023
Counter-examples to a conjecture of Karpenko for spin groups
Sanghoon Baek, Rostislav Devyatov
Consider the canonical morphism from the Chow ring of a smooth variety to the associated graded ring of the topological filtration on the Grothendieck ring of . In general,…