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Suggested Notation for Ratios and Cross-Ratios
Published online by Cambridge University Press: 03 November 2016
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.
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