Apollonius Problem and Caustics of an Ellipsoid

Year 2024, Volume: 17 Issue: 2, 402 - 420, 27.10.2024

Yagub Aliyev

https://doi.org/10.36890/iejg.1368456

Abstract

In the paper we discuss Apollonius Problem on the number of normals of an ellipse passing through a given point. It is known that the number is dependent on the position of the given point with respect to a certain astroida. The intersection points of the astroida and the ellipse are used to study the case when the given point is on the ellipse. The problem is then generalized for 3 dimensional space, namely for Ellipsoids. The number of concurrent normals in this case is known to be dependent on the position of the given point with respect to caustics of the ellipsoid. If the given point is on the ellipsoid then the number of normals is dependent on position of the point with respect to the intersections of the ellipsoid with its caustics. The main motivation of this paper is to classify all possible cases of these intersections.

Keywords

Ellipsoid, Apollonius, centro-surface, caustics, astroida, ellipse

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