Abstract
We study 4-dimensional orientable Riemannian manifolds equipped with a minimal and conformal foliation \({\mathcal {F}}\) of codimension 2. We prove that the two adapted almost Hermitian structures \(J_1\) and \(J_2\) are both cosymplectic if and only if \({\mathcal {F}}\) is Riemannian and its horizontal distribution \({\mathcal {H}}\) is integrable.
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Gudmundsson, S. Holomorphic harmonic morphisms from cosymplectic almost Hermitian manifolds. Geom Dedicata 178, 143–150 (2015). https://doi.org/10.1007/s10711-015-0049-9
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DOI: https://doi.org/10.1007/s10711-015-0049-9