Results 41 to 50 of about 1,343,954 (317)
Geodesic Density Regression for Correcting 4DCT Pulmonary Respiratory Motion Artifacts [PDF]
Medical Image Anal., 2021 Pulmonary respiratory motion artifacts are common in four-dimensional computed tomography (4DCT) of lungs and are caused by missing, duplicated, and misaligned image data.
Wei Shao +6 more
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Mathematics, 2020 In the paper, we consider geodesic mappings of spaces with an affine connections onto generalized symmetric and Ricci-symmetric spaces. In particular, we studied in detail geodesic mappings of spaces with an affine connections onto 2-, 3-, and m- (Ricci-)
Volodymyr Berezovski +3 more
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AIMS Mathematics, 2023 In this article, we introduce the fundamentals of the theory of demicontractive mappings in metric spaces and expose the key concepts and tools for building a constructive approach to approximating the fixed points of demicontractive mappings in this ...
Sani Salisu +3 more
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On geodesic mappings of symmetric pairs
Proceedings of the International Geometry Center, 2023 The paper treats properties of pseudo-Riemannian spaces admitting non-trivial geodesic mappings. A symmetric pair of pseudo-Riemannian spaces is a pair of spaces with coinciding values of covariant derivatives for their Riemann tensors. It is proved that the symmetric pair of pseudo-Riemannian spaces, which are not spaces of constant curvatures, are ...
Olexandr Latysh +2 more
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Finding shortest and nearly shortest path nodes in large substantially incomplete networks by hyperbolic mapping [PDF]
Nature Communications, 2022 Dynamic processes on networks, be it information transfer in the Internet, contagious spreading in a social network, or neural signaling, take place along shortest or nearly shortest paths.
M. Kitsak +7 more
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Fixed point theorems for enriched Kannan mappings in CAT(0) spaces
Fixed Point Theory and Algorithms for Sciences and Engineering, 2023 We present enriched Kannan and enriched Bianchini mappings in the framework of unique geodesic spaces. For such mappings, we establish the existence and uniqueness of a fixed point in the setting of CAT(0) spaces and show that an appropriate ...
A. Y. Inuwa +3 more
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Quasi-Isometric Mesh Parameterization Using Heat-Based Geodesics and Poisson Surface Fills
Mathematics, 2019 In the context of CAD, CAM, CAE, and reverse engineering, the problem of mesh parameterization is a central process. Mesh parameterization implies the computation of a bijective map ϕ from the original mesh M ∈ R 3 to the planar ...
Daniel Mejia-Parra +4 more
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Exact Voronoi diagram for topographic spatial analysis
GIScience & Remote Sensing, 2023 The Voronoi diagram (VD) is a fundamental geo-computing structure that has crucial applications. Computing this structure on a topographic surface requires having every point clustered on the geodesic distances, and thus the same challenging task as the ...
Xinqiao Duan, Lin Li, Yong Ge, Bo Liu
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(1,1)-geodesic maps into grassmann manifolds
Mathematische Zeitschrift, 1995 Let \(M\) be a Kähler manifold, \(D\) be the Levi-Civita connection extended complex-linearly to the complexification of the tangent bundle, \(N\) be a Riemannian manifold, and \(\varphi:M\to N\) be a smooth map. The Hessian \(Dd\varphi\) may be decomposed to \((2,0)\), \((1,1)\), \((0,2)\) parts. The map \(\varphi\) is called pluriharmonic if its \((1,
Tribuzy, R., Eschenburg, J.-H.
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Geodesic Mappings of Vn(K)-Spaces and Concircular Vector Fields
Mathematics, 2019 In the present paper, we study geodesic mappings of special pseudo-Riemannian manifolds called V n ( K ) -spaces. We prove that the set of solutions of the system of equations of geodesic mappings on V n ( K ) -spaces forms a ...
Igor G. Shandra, Josef Mikeš
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