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History of a theorem in Elementary Geometry

Published online by Cambridge University Press:  20 January 2009

J. S. Mackay
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The theorem is

If the straight lines bisecting the angles at the base of a triangle and terminated by the opposite sides be equal, the triangle is isosceles.

This theorem was in the year 1840 communicated by Professor Lehmus of Berlin to Jacob Steiner with a request for a pure geometrical proof of it. The request was complied with at the time, but Steiner's proof was not published till some years later.

Type
Research Article
Information
Proceedings of the Edinburgh Mathematical Society , Volume 20 , February 1901 , pp. 18 - 22
Copyright
Copyright © Edinburgh Mathematical Society 1901