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Suggested Notation for Ratios and Cross-Ratios

Published online by Cambridge University Press:  03 November 2016

Alfred Lodge
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Extract

I wish to call attention to the value, for some purposes, ot the notation for the ratio ; and for the cross-ratio .

For instance: in Menelaus’ theorem for the property of a transversal meeting the sides of a triangle ABC in the points P, Q, R, the first mentioned notation makes the property shine out very clearly The equation in the form is

,

which conspicuously separates the points on the transversal from the angular points of the triangle.

Type
Research Article
Information
The Mathematical Gazette , Volume 6 , Issue 98 , May 1912 , pp. 294 - 296
Copyright
Copyright © The Mathematical Association 1912

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