PAPER / ARXIV:2609.08119

Positive biorthogonal curvature on $S^2\times T^2$

Zhiqi Chen , Hui Zhang

RESUMO

We construct explicit Riemannian metrics with positive biorthogonal curvature on $S^2\times T^2$, answering a question of Bettiol. In particular, positive biorthogonal curvature on a closed four-manifold does not force its fundamental group to be virtually free.

NO MESMO MAPA

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