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We prove that an infinite family of virtually overtwisted tight contact structures
discovered by Honda on certain circle bundles over surfaces admit no symplectic
semi–fillings. The argument uses results of Mrowka, Ozsváth and Yu on the
translation–invariant solutions to the Seiberg–Witten equations on cylinders and the
non–triviality of the Kronheimer–Mrowka monopole invariants of symplectic
fillings.
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