Results 11 to 20 of about 13,984 (264)
Relationship of upflowing ion beams and conics around the dayside cusp/cleft region to the interplanetary conditions [PDF]
Annales Geophysicae, 2002 The dayside cusp/cleft region is known as a major source of upflowing ionospheric ions to the magnetosphere. Since the ions are supposed to be energized by an input of energy from the dayside magnetospheric boundary region, we examined the ...
W. Miyake, W. Miyake, T. Mukai, N. Kaya
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Crossing limit cycles for piecewise linear differential centers separated by a reducible cubic curve
Electronic Journal of Qualitative Theory of Differential Equations, 2020 As for the general planar differential systems one of the main problems for the piecewise linear differential systems is to determine the existence and the maximum number of crossing limits cycles that these systems can exhibit.
Jeidy Jimenez +2 more
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On the Implicit Equation of Conics and Quadrics Offsets
Mathematics, 2021 A new determinantal representation for the implicit equation of offsets to conics and quadrics is derived. It is simple, free of extraneous components and provides a very compact expanded form, these representations being very useful when dealing with ...
Jorge Caravantes +3 more
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Conic-connected manifolds [PDF]
Journal für die reine und angewandte Mathematik (Crelles Journal), 2010 We study a particular class of rationally connected manifolds, $X\subset \p^N$, such that two general points $x,x' \in X$ may be joined by a conic contained in $X$. We prove that these manifolds are Fano, with $b_2\leq 2$. Moreover, a precise classification is obtained for $b_2=2$.
IONESCU P, RUSSO, Francesco
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Cubic symmetroids and vector bundles on a quadric surface [PDF]
, 2012 We investigate the jumping conics of stable vector bundles $\Ee$ of rank 2 on a smooth quadric surface $Q$ with the Chern classes $c_1=\Oo_Q(-1,-1)$ and $c_2=4$ with respect to the ample line bundle $\Oo_Q(1,1)$. We describe the set of jumping conics of $
Huh, Sukmoon
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Claude Mydorge Reader and Interpreter of Apollonius’ Conics
Mathematics, 2021 In 1639, the treatise Prodromi catoptricorum et dioptricorum sive Conicorum operis ad abdita radii reflexi et refracti mysteria praevij et facem praeferentis. Libri quatuor priores by Claude Mydorge was printed in Paris.
Emilia Florio
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Curves on Heisenberg invariant quartic surfaces in projective 3-space [PDF]
, 2018 This paper is about the family of smooth quartic surfaces $X \subset \mathbb{P}^3$ that are invariant under the Heisenberg group $H_{2,2}$. For a very general such surface $X$, we show that the Picard number of $X$ is 16 and determine its Picard group ...
A Garbagnati +25 more
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Construction of Complete (k,n)-arcs from Conics in PG(2,13) [PDF]
Al-Rafidain Journal of Computer Sciences and Mathematics, 2014 This research contains the construction of complete (k,n)-arcs using geometric method and putting a condition that each constructed arc must begin with reference unit four points ,then constructing all conics that each one contains the fundamental ...
Shua’a Aziz
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Mathematics, 2022 This article proposes a possible path devoted to upper secondary school and early university students, as well as training teachers, with the aim to build a conscious approach to the learning/teaching of the conics, which uses, for an educational purpose,
Emilia Florio
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General Equations of Non-Degenerate Conics
Modelling in Civil Environmental Engineering, 2021 In this article, we present a method to obtain equations of non-degenerate conics in an initial Cartesian frame (xOy), starting from their canonical expressions in another Cartesian frame (x′′Cy′′).
Mihai Radu-Ioan
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