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Parity criterion and Dehn twists for unstabilized Heegaard splittings
We give a parity condition of a Heegaard diagram to show that it is
unstabilized. This improves the result of [5]. As an application, we construct
unstabilized Heegaard splittings by Dehn twists on any given Heegaard
splitting.Comment: 10 pages, 6 figure
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