Results 21 to 30 of about 13,984 (264)
Incidence structures from the blown-up plane and LDPC codes [PDF]
, 2011 In this article, new regular incidence structures are presented. They arise from sets of conics in the affine plane blown-up at its rational points. The LDPC codes given by these incidence matrices are studied. These sparse incidence matrices turn out to
Couvreur, Alain
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Students' Mistakes and Misconceptions on the Subject of Conics
International Journal of Education, 2020 The purpose of this study is to determine the levels of geometric thinking, mistakes, and misconceptions of students on the concept of conics. This study was conducted on 91 students in the first semester in 2017 at one of the universities in Indonesia ...
Eyus Sudihartinih, Tia Purniati
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Crossing Limit Cycles of Planar Piecewise Linear Hamiltonian Systems without Equilibrium Points
Mathematics, 2020 In this paper, we study the existence of limit cycles of planar piecewise linear Hamiltonian systems without equilibrium points. Firstly, we prove that if these systems are separated by a parabola, they can have at most two crossing limit cycles, and if ...
Rebiha Benterki, Jaume LLibre
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Groups and monoids of Pythagorean triples connected to conics
Open Mathematics, 2017 We define operations that give the set of all Pythagorean triples a structure of commutative monoid. In particular, we define these operations by using injections between integer triples and 3 × 3 matrices.
Murru Nadir +3 more
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Prime Fano threefolds of genus 12 with a $G_m$-action
, 2018 We give an explicit construction of prime Fano threefolds of genus 12 with a $G_m$-action, describe their isomorphism classes and automorphism groups.Comment: 14 pages, LaTeX, updated version, to appear in \'Epijournal de G\'eom\'etrie Alg\'ebrique ...
Kuznetsov, Alexander, Prokhorov, Yuri
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APPLICATION OF DANDELIN’S THEOREM TO DRAWING CIRCLES IN PARALLEL PERSPECTIVE
Journal of Industrial Design and Engineering Graphics, 2017 The paper analyses a problem of great theoretical importance in practice of perspective: the nature of the perspective of a circle from the horizontal plane according to the relative position between the spectator plane (parallel to the picture plane ...
Daniel Dobre
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Harbourne constants and conic configurations on the projective plane
, 2015 In this note we exhibit the so-called Harbourne constants which capture and measure the Bounded Negativity on various birational models of an algebraic surface.
Bauer +6 more
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Conic Approximation of Conic Offsets
Journal of Symbolic Computation, 1997 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Conics Inscribed in a Standard Triangle in the Isotropic Plane
MathematicsIn this paper, we study conics inscribed in a standard triangle in the isotropic plane. Our research gives the conditions under which the inscribed conic is an ellipse, a parabola, or a hyperbola, expressed through the elements of a standard triangle. We
Vladimir Volenec, Ružica Kolar-Šuper
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A statistical study of field-aligned electron beams associated with ion conics events [PDF]
Annales Geophysicae, 1998 A statistical study of field-aligned electron beams associated with upflowing ion conics is presented from Exos-D (Akebono) observations below 10 000 km.
W. Miyake, T. Mukai, N. Kaya
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