A Smale-Barden manifold admitting K-contact but not Sasakian structure
نشر في Vicente Munoz
بتاريخ 2020
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We give the first example of a simply connected compact 5-manifold (Smale-Barden manifold) which admits a K-contact structure but does not admit any Sasakian structure, settling a long standing question of Boyer and Galicki.