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A locally-built, LLM-digested index of recent arXiv papers in quant finance, geometry/topology, and statistical ML — keyword search served straight from SQLite on this machine.

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48 results for slant ruled surfaces

In this study, we define some new types of ruled surfaces called slant ruled surfaces. We give some characterizations for a regular ruled surface to be a slant ruled surface in Euclidean 3- space. We show that if the slant ruled surface is developable then the striction curve is a general helix or a slant helix accordi…

2013-11-04abs ↗pdf ↗

In this study, we introduce Darboux slant ruled surfaces in the Euclidean 3-space which is defined by the property that the Darboux vector of orthonormel frame of ruled surface makes a constant angle with a fixed, non-zero direction. We obtain the characterizations of Darboux slant ruled surfaces regarding the conical …

2013-11-04abs ↗pdf ↗

In this study, we give the relationships between the conical curvatures of ruled surfaces drawn by the unit vectors of the ruling, central normal and central tangent of a regular ruled surface in the Euclidean -space. We obtain the differential equations characterizing slant ruled surfaces and if the reference ruled su…

2013-11-27abs ↗pdf ↗

This study examines geometric properties and offsets of slant timelike-ruled surfaces.

problem Geometric properties and offsets of slant timelike-ruled surfaces in Minkowski 3-space.
method Derivation of parametric formulation, conditions for coaxial alignment, examination through Blaschke and Darboux frames.
result Conditions ensuring the coaxial alignment of the central normal with the ruling direction of the offset surface.

Study of curves and surfaces in Riemannian spaces making a constant angle with a parallel transported direction.

problem Understanding geometric properties of curves and surfaces in Riemannian spaces.
method Developing a theoretical framework to study curves and surfaces by their angle with a parallel transported vector field.
result Surfaces making a constant angle with a parallel transported direction are extrinsically flat ruled surfaces.

New type of ruled surfaces studied with properties and examples.

problem Characterizing and understanding new types of ruled surfaces.
method Definition of a new orthonormal frame, calculation of Gaussian and mean curvatures, analysis of Weingarten map and geodesic properties.
result Conditions for an OT-surface to be flat or minimal are derived, and examples of helices and slant helices are provided.

Defines and analyzes generalized normal ruled surfaces of curves in 3D space.

problem Understanding the geometry of generalized normal ruled surfaces.
method Calculates Gaussian and mean curvatures to determine surface properties and examines curve conditions.
result Determines when surfaces are flat or minimal and identifies specific curve types.

In this paper, we study the spherical indicatrices of W-direction curves in three dimensional Euclidean space which were defined by using the unit Darboux vector field W of a Frenet curve, in [11]. We obtain the Frenet apparatus of these spherical indicatrix curves and the characterizations of being general helix and s…

2015-06-12abs ↗pdf ↗

In this paper we find examples of slant surfaces in the nearly Kahler six sphere. First, we characterize two-dimensional small and great spheres which are slant. Their description is given in terms of the associative 3-form in $\Im \OO .$ Later on, we classify the slant surfaces of S6S^6 which are orbits of maximal tor…

2010-09-27abs ↗pdf ↗

Study of light function singularities on surfaces.

problem Characterizing singularities of the slant function on surfaces.
method Analyzing the differential geometry of the parabolic set and its spherical image under the Gauss map.
result The type of singularities of the slant function is determined by the geometry of the parabolic set and its spherical image.

The study extends Legendre and slant curves to Minkowski surfaces, providing new characterizations.

problem Characterizing N-Legendre and N-slant curves in Minkowski surfaces.
method Extending previous work on Legendre and slant curves to Minkowski surfaces, analyzing properties under the induced Sasaki metric.
result Several important characterizations of N-Legendre and N-slant curves in Minkowski surfaces are provided.

The study explores properties of slant and semi-slant submanifolds in metallic Riemannian manifolds.

problem Characterizing and understanding slant and semi-slant submanifolds in metallic Riemannian manifolds.
method Characterizations and integrability conditions for distributions in semi-slant submanifolds.
result Examples of semi-slant submanifolds in metallic and Golden Riemannian manifolds are provided.

We introduce the notions of pointwise almost h-slant submanifolds and pointwise almost h-semi-slant submanifolds as a generalization of slant submanifolds, pointwise slant submanifolds, semi-slant submanifolds, and pointwise semi-slant submanifolds. We have characterizations and investigate the integrability of distrib…

2013-12-12abs ↗pdf ↗

The paper studies bi-slant Riemannian maps to Kenmotsu manifolds and derives inequalities.

problem Investigating bi-slant Riemannian maps and their properties.
method Introducing and studying bi-slant Riemannian maps, deriving curvature relations and inequalities.
result Construction of Chen-Ricci inequalities, DDVV inequalities, and optimal inequalities involving Casorati curvatures.

Study on slant submanifolds with new conditions and transitivity.

problem Conditions for slant submanifolds under different structures.
method Analyzes pointwise slant submanifolds under two anti-commuting almost Hermitian structures and their transitivity.
result Property of being pointwise slant is transitive on a class of proper pointwise slant immersed submanifolds.

This study examines Clairaut slant Riemannian maps from Riemannian to Kähler manifolds.

problem Characterizing Clairaut slant Riemannian maps between Riemannian and Kähler manifolds.
method Analyzing necessary and sufficient conditions for geodesics, Clairaut slant maps, total geodesy, integrability, and harmonicity.
result Obtained inequalities involving second fundamental forms of Clairaut slant Riemannian maps.

In this study, we have identified V3V_3 slant helix (2nd2^{nd} type slant helix, V5V_5 slant helix (3rd3^{rd} type slant helix) and attained some characteristic properties in the Euclidean 5-Space E5E^5. In addition to this, we have proven that there are no other helices other than V1V_1 helix (inclined curve), V3V_3 sla…

2014-02-13abs ↗pdf ↗

In this paper, we investigate a curve whose spherical image the tangent indicatrix and binormal indicatrix is slant helix and called it as a slant helix. We obtain that the spherical images are spherical slant helices defined by [3]. This notation is a generalization of a slant helix. Furthermore, we have given some ch…

2013-11-19abs ↗pdf ↗

The paper defines Vn-slant helices in a lightlike cone and their curvature functions.

problem Understanding Vn-slant helices in a lightlike cone Qn+1.
method Defined Vn-slant helices and their harmonic curvature functions in Qn+1, expressed differential equations, and provided conditions for being Vn-slant helices.
result Differential equations of harmonic curvature functions and necessary conditions for Vn-slant helices in Qn+1.

Study on warped product pointwise semi-slant submanifolds in Sasakian and cosymplectic manifolds.

problem Investigate the geometry of pointwise semi-slant submanifolds and their warped products.
method Using the notion of pointwise slant submanifolds, investigate the geometry of pointwise semi-slant submanifolds and their warped products in Sasakian and cosymplectic manifolds.
result Prove the existence of no proper pointwise semi-slant warped product submanifolds other than contact CR-warped products in Sasakian manifolds.

Study on pointwise pseudo-slant warped product submanifolds in Kähler manifolds.

problem Characterizing and studying properties of pointwise pseudo-slant submanifolds in Kähler manifolds.
method Deriving conditions for integrability, totally geodesic foliation, and isometric immersions of pointwise pseudo-slant submanifolds.
result Necessary and sufficient conditions for pointwise pseudo-slant warped product and locally Riemannian product.

Study properties of hemi-slant submanifolds in metallic Riemannian manifolds.

problem Characterize hemi-slant submanifolds in metallic Riemannian manifolds.
method Characterizations and integrability conditions for distributions are derived.
result Examples of hemi-slant submanifolds in metallic and Golden Riemannian manifolds are provided.

As a generalization of slant Riemannian maps (Sahin), semi-slant Riemannian maps (Park), almost h-slant submersions (Park 2012), and almost h-semi-slant submersions (Park 2011), we introduce the notion of almost h-semi-slant Riemannian maps from almost quaternionic Hermitian manifolds to Riemannian manifolds. We invest…

2012-09-24abs ↗pdf ↗

In this paper, we define slant helices in three dimensional Lie Groups with a bi-invariant metric and obtain a characterization of slant helices. Moreover, we give some relations between slant helices and their involutes, spherical images.

2012-03-06abs ↗pdf ↗

In this paper we study slant submanifolds of Lorentzian almost contact manifolds. We have taken the submanifold as a space like and then defined the slant angle on a submanifold and thus we extended the results of A. Lotta (Slant submanifolds in contact geometry [8]) and M. A. Khan et. al. (Slant submanifolds of Lorent…

2012-04-27abs ↗pdf ↗

As a generalization of holomorphic submersions, anti-invariant submersions and slant submersions, we introduce slant Riemannian maps from almost Hermitian manifolds to Riemannian manifolds. We give examples, obtain the existence conditions of slant Riemannian maps and investigate harmonicity of such maps. We also obtai…

2012-06-15abs ↗pdf ↗

Isophote comprises a locus of the surface points whose normal vectors make a constant angle with a fixed vector. In this paper, isophote curves are studied on timelike surfaces in Minkowski 3-space E31. The axises of spacelike and timelike isophote curves are found via their Darboux frames. Subsequently, the relationsh…

2012-03-20abs ↗pdf ↗

In this paper, we define a new kind of slant helix called f-eikonal V_{n}-slant helix in Pseudo- Riemannian manifolds and give the definition of harmonic curvature functions related to the f-eikonal V_{n}-slant helix in Pseudo- Riemannian manifolds. Moreover, we give some characterizations of f-eikonal V_{n}-slant heli…

2013-05-30abs ↗pdf ↗

In this paper, in Euclidean n -space, we investigate the relation between slant helices and spherical helices. Moreover, in E n, we show that a slant helix and the tangent indicatrix of the slant helix have the same axis (or direction). Also, we give the important relations between slant helices, spherical helices in E…

2011-08-17abs ↗pdf ↗