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【講演要旨】：The moduli space of SU(N) instantons in the presence
of a surface operator can be described by the representations of
the so-called chain-saw quiver. Consequently one can write down
the instanton partition function as a summation over the fixed point
contributions labeled by Young diagrams. We argue that the instanton
partition function agrees with the inner product of a coherent state
(Whittaker vector) in the Verma module.