It iswell-known that the positionvector function is themost basic geometric object for a
surface immersed in the three dimensional Euclidean space E^3. In 2001, B.-Y. Chen …

In this paper, we define and, then, we characterize constant angle spacelike and timelike
surfaces in the three-dimensional Heisenberg group, equipped with a 1-parameter family of …

Let N be a Lorentz surface and let∂ t be a unit vector field on the Lorentz manifold N× R
tangent to R. A timelike surface Σ in N× R is said to have a canonical null direction with …

In this work, we study helix spacelike and timelike surfaces in the Lorentzian Berger
sphere\mathbb S _ ε^ 3 S ε 3, that is the three-dimensional sphere endowed with a 1 …

We study constant angle semi-Riemannian hypersurfaces M immersed in semi-Riemannian
space forms, where the constant angle is defined in terms of a closed and conformal vector …

Batista 在M 2 (c)× R 中的具有常平均曲率的曲面上引入了一个特殊的(1, 1) 型张量S. 之后,
Fetcu 和Rosebberg 将张量S 推广到M n (c)× R 中的具有平行平均曲率向量的曲面上 …

Passive positioning systems with a small aperture array exhibit poor accuracy of target
estimation in far-field environments. To improve this accuracy, this paper presents a novel …

In this paper we introduce a new method for the study of non-degenerate hypersurfaces
immersed into product spaces of the form M^ n * RM n× R, with M^ n M na Riemannian …

A generalized constant ratio surface (GCR surface) is defined by the property that the
tangential component of the position vector is a principal direction at each point on the …

New Classification Results on Surfaces with a Canonical Principal Direction in the Minkowski
3-space Page 1 Filomat 31:19 (2017), 6023–6040 https://doi.org/10.2298/FIL1719023K …