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A geometric proof of the Siebeck-Marden theorem

  • Université Savoie Mont Blanc

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The Siebeck-Marden theorem relates the roots of a third degree polynomial and the roots of its derivative in a geometrical way. A few geometric arguments imply that every inellipse for a triangle is uniquely related to a certain logarithmic potential via its focal points. This fact provides a new direct proof of a general form of the result of Siebeck and Marden.

Original languageEnglish
Pages (from-to)459-463
Number of pages5
JournalAmerican Mathematical Monthly
Volume124
Issue number5
DOIs
Publication statusPublished - 1 May 2017
Externally publishedYes

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