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math.AG2026
Fundamental forms and infinitesimal symmetries of projective varieties
Jun-Muk Hwang, Qifeng Li
We give a bound on the dimension of the linear automorphism group of a projective variety in terms of its fundamental forms at a general point. Moreover, w…
math.AG2026
Homological rigidity and Schur rigidity of Schubert varieties in rational homogeneous spaces
Cong Ding, Qifeng Li
A Schubert variety on a rational homogenous space is said to be homologically rigid, if any subvariety on representing the same homology class with must…