Quadrilaterals inscribed in convex curves
| Autor: | Benjamin Matschke |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Pure mathematics
Quadrilateral Applied Mathematics General Mathematics 010102 general mathematics Regular polygon Metric Geometry (math.MG) 01 natural sciences Set (abstract data type) Mathematics - Metric Geometry Isosceles triangle Piecewise FOS: Mathematics Mathematics::Metric Geometry Mathematics - Combinatorics Combinatorics (math.CO) 0101 mathematics Special case Symmetry (geometry) 53A04 55M20 55R80 Inscribed figure Mathematics |
| Popis: | We classify the set of quadrilaterals that can be inscribed in convex Jordan curves, in the continuous as well as in the smooth case. This answers a question of Makeev in the special case of convex curves. The difficulty of this problem comes from the fact that standard topological arguments to prove the existence of solutions do not apply here due to the lack of sufficient symmetry. Instead, the proof makes use of an area argument of Karasev and Tao, which we furthermore simplify and elaborate on. The continuous case requires an additional analysis of the singular points, and a small miracle, which then extends to show that the problems of inscribing isosceles trapezoids in smooth curves and in piecewise $C^1$ curves are equivalent. 17 pages, 9 figures, accepted version. Section 5.3 is rewritten and combined with the recent result of Greene and Lobb [arXiv:2011.05216 [math.GT]]. Parts have been independently obtained by Akopyan and Avvakumov [arXiv:1712.10205 [math.MG]], see the footnote on page 1 |
| Databáze: | OpenAIRE |
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