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In the present paper we consider a special class of spacelike surfaces in the Minkowski 4-space which are one-parameter systems of meridians of the rotational hypersurface with timelike or spacelike axis. They are called meridian surfaces…

Differential Geometry · Mathematics 2016-07-15 Kadri Arslan , Velichka Milousheva

In the present article we study a special class of surfaces in the four-dimensional Euclidean space, which are one-parameter systems of meridians of the standard rotational hypersurface. They are called meridian surfaces. We classified…

Differential Geometry · Mathematics 2015-05-18 Betül Bulca , Kadri Arslan

Meridian surfaces in the Euclidean 4-space are two-dimensional surfaces which are one-parameter systems of meridians of a standard rotational hypersurface. On the base of our invariant theory of surfaces we study meridian surfaces with…

Differential Geometry · Mathematics 2016-01-26 Georgi Ganchev , Velichka Milousheva

In this paper, we study rotational surfaces of elliptic, hyperbolic and parabolic type with pointwise 1-type Gauss map which have spacelike profile curve in four dimensional pseudo Euclidean space E4-2 and obtain some characterizations for…

Differential Geometry · Mathematics 2017-07-14 Ferdag Kahraman Aksoyak , Yusuf Yayli

We construct a special class of Lorentz surfaces in the pseudo-Euclidean 4-space with neutral metric which are one-parameter systems of meridians of rotational hypersurfaces with lightlike axis and call them meridian surfaces. We give the…

Differential Geometry · Mathematics 2018-10-02 Velichka Milousheva

We consider a special class of spacelike surfaces in the Minkowski 4-space which are one-parameter systems of meridians of the rotational hypersurface with timelike or spacelike axis. We call these surfaces meridian surfaces of elliptic or…

Differential Geometry · Mathematics 2016-07-15 Georgi Ganchev , Velichka Milousheva

We construct a special class of spacelike surfaces in the Minkowski 4-space which are one-parameter systems of meridians of the rotational hypersurface with lightlike axis and call these surfaces meridian surfaces of parabolic type. They…

Differential Geometry · Mathematics 2016-01-27 Georgi Ganchev , Velichka Milousheva

In this paper, we study meridian surfaces of Weingarten type in Euclidean 4-space E^4. We give the neccessary and sufficient conditions for a meridian surface in E^4 to become Weingarten type.

Differential Geometry · Mathematics 2013-05-15 Gunay Ozturk , Betul Bulca , Bengu Kilic Bayram , Kadri Arslan

In the present paper we consider a special class of Lorentz surfaces in the four-dimensional pseudo-Euclidean space with neutral metric which are one-parameter systems of meridians of rotational hypersurfaces with timelike or spacelike axis…

Differential Geometry · Mathematics 2017-04-27 Betul Bulca , Velichka Milousheva

We apply the invariant theory of surfaces in the four-dimensional Euclidean space to the class of general rotational surfaces with meridians lying in two-dimensional planes. We find all minimal super-conformal surfaces of this class.

Differential Geometry · Mathematics 2010-11-22 Velichka Milousheva

In this work, we study some classes of rotational surfaces in the pseudo-Euclidean space $\mathbb{E}^4_t$ with profile curves lying in 2-dimensional planes. First, we determine all such surfaces in the Minkowski 4-space $\mathbb{E}^4_1$…

Differential Geometry · Mathematics 2015-08-14 Burcu Bektaş , Elif Özkara Canfes , Uğur Dursun

We consider a special family of 2-dimensional timelike surfaces in the Minkowski 4-space $\mathbb{R}^4_1$ which lie on rotational hypersurfaces with timelike axis and call them meridian surfaces of elliptic type. We study the following…

Differential Geometry · Mathematics 2025-04-02 Victoria Bencheva , Velichka Milousheva

In this paper, we study general rotational surfaces in the 4- dimensional pseudo-Euclidean space E4-2 and obtain a characterization of flat general rotation surfaces with pointwise 1-type Gauss map in E4-2 and give an example of such…

Differential Geometry · Mathematics 2013-02-14 Ferdağ Kahraman Aksoyak , Yusuf Yaylı

We construct a special class of Lorentz surfaces in the pseudo-Euclidean 4-space with neutral metric which are one-parameter systems of meridians of rotational hypersurfaces with timelike or spacelike axis and call them meridian surfaces.…

Differential Geometry · Mathematics 2017-04-27 Betul Bulca , Velichka Milousheva

In this paper we study general rotational surfaces in the 4- dimensional Euclidean space E4 and give a characterization of flat general rotation surface with pointwise 1-type Gauss map. Also, we show that a non-planar flat general rotation…

Differential Geometry · Mathematics 2013-02-13 Ferdağ Kahraman Aksoyak , Yusuf Yaylı

For a surface in the 3-dimensional real projective space, we define a Gauss map, which is a quadric in $\mathbb R^{4}$ and called the first-order Gauss map. It will be shown that the surface is a Demoulin surface if and only if the…

Differential Geometry · Mathematics 2013-04-15 Shimpei Kobayashi

In the present study we consider the generalized rotational surfaces in Euclidean spaces. Firstly, we consider generalized spherical curves in Euclidean $(n+1)-$space $\mathbb{E}^{n+1}$. Further, we introduce some kind of generalized…

Differential Geometry · Mathematics 2016-05-03 Bengu Bayram , Kadri Arslan , Betul Bulca

We perform a systematic study of the image of the Gauss map for complete minimal surfaces in Euclidean four-space. In particular, we give a geometric interpretation of the maximal number of exceptional values of the Gauss map of a complete…

Differential Geometry · Mathematics 2023-08-31 Reiko Aiyama , Kazuo Akutagawa , Satoru Imagawa , Yu Kawakami

In this paper, we study the Gauss map of the surfaces in the de Sitter space-time $\mathbb S^4_1(1)$. First, we prove that a space-like surface lying in the de Sitter space-time has pointwise 1-type Gauss map if and only if it has parallel…

Differential Geometry · Mathematics 2013-11-11 Nurettin Cenk Turgay

We consider a special class of timelike surfaces in the four-dimensional Minkowski space which are one-parameter systems of meridians of rotational hypersurfaces with spacelike axis and call them meridian surfaces of hyperbolic type. We…

Differential Geometry · Mathematics 2026-05-29 Victoria Bencheva , Velichka Milousheva
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