MINIMAL SCHUBERT VARIETIES ADMITTING SEMISTABLE POINTS FOR EXCEPTIONAL CASES

摘要

For any simple,simply connected algebraic group G of exceptional types （E_6, E_7, E_8, F_4, and G_2) and for any maximal parabolic subgroup P of G, we describe all minimal (with respect to inclusion) Schubert varieties in G/P admitting semistable points for the action of a maximal torus T with respect to an ample line bundle on G/P. This completes the answer to a question proposed in [8] and settled there in the classical case.