A note on almost contact Riemannian 3-manifolds

Abstract : We investigate curvatures of normal almost contact Riemannian 3-manifolds. In particular, we show that Kenmotsu 3-manifolds of constant scalar curvature are of constant curvatur

Biharmonic curves in Minkowski 3

We give a differential geometric characterization for biharmonic curves with null principal normal in Minkowski 3-space