On certain classes of almost product structures
The paper studies the geometrical meaning of certain conditions on plane fields that were imposed by the reviewer for obtaining different classes of almost-product manifolds [Rend. Mat. Appl., VII. Ser. 3, 577--592 (1983; Zbl 0538.53045) (see the following review)]. Three of the conditions are of transversal nature in the sense of Haefliger structures. The umbilical condition in the case of foliations, leads to conformal foliations. Some examples are given.
scientific article; zbMATH DE number 3855926