Almost para-Hermitian and almost paracontact metric structures induced by natural Riemann extensions

Cornelia-Livia Bejan, Galia Nakova

In this paper we consider a manifold $(M,\nabla )$ with a symmetric linear connection $\nabla$ which induces on the cotangent bundle $T^{\ast }M$ of $M$ a semi-Riemannian metric $\overl…