No CrossRef data available.
Published online by Cambridge University Press: 03 November 2016
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.