ON ALMOST CONTACT METRIC STRUCTURE OF COSYMPLECTIC TYPE ON A 3-HYPERSURFACE OF THE SIX-DIMENSIONAL SPHERE
The Cartan structural equation of the almost contact metric structure induced on an oriented 3-hypersurfac in the nearly Kählerian six-dimensional sphere are obtained. it is proved that 3-hypersurfaces of the nearly Kählerian six-dimensional sphere admit non-cosymplectic and non-Kenmotsu almost contact metric structure of cosymplectic type.