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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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