Affine closure of T*O_n in sl_n is isomorphic via C*-Hamiltonian reduction to the minimal nilpotent orbit closure in so_{2n+2}, and has no symplectic resolution.
Birkar, Singularities of linear systems and boundedness of F ano varieties , Ann.\ of Math
2 Pith papers cite this work. Polarity classification is still indexing.
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Proves optimal Kawamata-Miyaoka inequality for terminal Q-Fano threefolds of index >=3 and derives c1^3 < 3 c2 c1 for all such threefolds.
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A connection between minimal nilpotent orbits of types A and D via Hamiltonian reduction
Affine closure of T*O_n in sl_n is isomorphic via C*-Hamiltonian reduction to the minimal nilpotent orbit closure in so_{2n+2}, and has no symplectic resolution.
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Kawamata-Miyaoka-type inequality for $\mathbb Q$-Fano varieties with canonical singularities II: Terminal $\mathbb Q$-Fano threefolds
Proves optimal Kawamata-Miyaoka inequality for terminal Q-Fano threefolds of index >=3 and derives c1^3 < 3 c2 c1 for all such threefolds.