Zobrazeno 1 - 10
of 3 953
pro vyhledávání: '"Quadric"'
Publikováno v:
AIMS Mathematics, Vol 9, Iss 10, Pp 29333-29345 (2024)
Quadrics are important in finite geometry and can be used to construct binary codes. In this paper, we first define an incidence matrix $ M $ based on points and non-degenerate quadrics in the classical projective space PG$ (n-1, q) $, where $ q $ is
Externí odkaz:
https://doaj.org/article/8c484013b967450b8fbbd0d2ba7f9ace
Autor:
Hamed Faraji, Shahroud Azami
Publikováno v:
AUT Journal of Mathematics and Computing, Vol 6, Iss 1, Pp 51-62 (2024)
In this paper, we will focus our attention on the structure of $h$-almost Ricci solitons on complex hyperbolic quadric. We will prove non-existence a contact real hypersurface in the complex hyperbolic quadric $Q^{m^*}, m\geq 3$, admitting the gradie
Externí odkaz:
https://doaj.org/article/bbf74f89eacc469ab99cf44b50933e06
Publikováno v:
Demonstratio Mathematica, Vol 56, Iss 1, Pp 246-266 (2023)
In this article, we introduce a new family of real hypersurfaces in the complex hyperbolic quadric Qn∗=SO2,no∕SO2SOn{{Q}^{n}}^{\ast }=S{O}_{2,n}^{o}/S{O}_{2}S{O}_{n}, namely, the ruled real hypersurfaces foliated by complex hypersurfaces. Berndt
Externí odkaz:
https://doaj.org/article/9bfcc62f152d423eb0ab18bdfe35df7e
Publikováno v:
Royal Society Open Science, Vol 11, Iss 5 (2024)
Existing failure criteria for orthotropic materials are subject to an underlying assumption which cause contradictions when applied to genuinely orthotropic materials that are significantly anisotropic in elasticity as well as in strengths. For such
Externí odkaz:
https://doaj.org/article/9bf5c6428cdb46299d61d39075f29e98
Autor:
Mattie Ji
Publikováno v:
Mathematics, Vol 12, Iss 15, p 2339 (2024)
The Euler characteristic transform (ECT) is an integral transform used widely in topological data analysis. Previous efforts by Curry et al. and Ghrist et al. have independently shown that the ECT is injective on all compact definable sets. In this w
Externí odkaz:
https://doaj.org/article/824e2c69bb304108a7473cdc34b1e0d8
Akademický článek
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Autor:
Edoardo Ballico
Publikováno v:
Cubo, Vol 25, Iss 2, Pp 331-347 (2023)
Let $X\subset \PP^r$ be an integral projective variety. We study the dimensions of the joins of several copies of the osculating varieties $J(X,m)$ of $X$. Our methods are general, but we give a full description in all cases only if $X$ is a linearly
Externí odkaz:
https://doaj.org/article/22dd748c68db47fca8a7b3c8ed834013
Publikováno v:
CT Lilun yu yingyong yanjiu, Vol 32, Iss 1, Pp 35-42 (2023)
Quadric surface is a common type of workpiece shape in industry. It can be imaged by computed tomography (CT). A sample object was scanned and its slices were reconstructed to measure its internal quadric surface. We used the U-net image segmentation
Externí odkaz:
https://doaj.org/article/edbab5e587aa46989b25b7eee4be1498
Publikováno v:
Analele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, Vol 31, Iss 1, Pp 71-96 (2023)
Using the high symmetry in the geometry of a smooth projective quadric, we construct effectively new families of smooth projective rational surfaces whose nef divisors are regular, and whose effective monoids are finitely generated by smooth projecti
Externí odkaz:
https://doaj.org/article/a67ffbb97113422fad9f9773a12271a5
Autor:
S.V. Matsievsky
Publikováno v:
Дифференциальная геометрия многообразий фигур, Iss 53, Pp 84-93 (2022)
A model of linear fractional transformations of the complex plane in the form of points of the complex three-dimensional projective space without a linear “forbidden” quadric is presented. A model of real linear fractional transformations of the
Externí odkaz:
https://doaj.org/article/fb57a7f169114ac1b5bc66655d600ee9