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We prove the crepant transformation conjecture for relative Grassmann flops over a smooth base B. We show that the I-functions of the respective GIT quotients are related by analytic continuation and a symplectic transformation. We verify that the symplectic transformation is compatible with Iritani's integral structure, that is, that it is induced by a Fourier-Mukai transform in K-theory.
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Priddis et al. (2024) studied this question.
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