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math.RT2026
Torsion proliferation
Joseph Baine, Daniel Tubbenhauer
This paper considers the generic behaviour of sheaves supported on Schubert varieties in finite flag varieties. Our main results are that, for any fixed prime , as the rank of t…
math.RT2026
The geometry of tilting composition series via Richardson varieties
Joseph Baine, Chris Hone
We prove the (graded) Jordan--Hölder multiplicities of (mixed) tilting sheaves on flag varieties admit a geometric interpretation as the hypercohomology of certain sheaves on Richa…