Geodesic
Almost contact metric hypersurfaces with small type numbers in $W_4$-manifolds
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2018), pp. 67-70 
M. B. Banaru. Almost contact metric hypersurfaces with small type numbers in $W_4$-manifolds. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2018), pp. 67-70. http://geodesic.mathdoc.fr/item/VMUMM_2018_1_a10/
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Voir la notice de l'article provenant de la source Math-Net.Ru

It is proved that in a $W_4$-manifold, the almost contact metric structures on a hypersurface with type number 1 and on a hypersurface with type number 0 are identical.

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