Co-isotropic submanifolds of a para-cokählerian manifold with concircular structure vector field (Q1066483)

The authors study the concept of CR-submanifold in a para-cokählerian manifold [see the authors, C. R. Acad. Sci., Paris, Sér. A 285, 723-726 (1977; Zbl 0371.53046)]. Here they prove that any co-isotropic submanifold of a para-cokählerian manifold has two CR-structures and then they obtain results on the geometry of the distributions involved in the definition of a CR-submanifold. Special attention is paid to the case of an improper immersion of a co-isotropic submanifold into a para- cokählerian manifold with a concircular structure vector field.