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math.AG2026
A counterexample to a global-dimension bound for weighted projective lines
Bochao Kong, Yeqin Liu, Yu Shen
We observe that standard derived equivalences give a counterexample to a conjecture of Kalck on global dimension for weighted projective lines. For the root stack $X=\mathbb{P}^1\l…
math.RA2026
A counterexample to Han's conjecture
Bochao Kong, Yeqin Liu, Yu Shen
There is a finite dimensional -algebra with and for .