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Mathematical Notes
Published online by Cambridge University Press: 03 November 2016
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- Copyright © Mathematical Association 1897
References
page 86 note * Pairs of points AA‵, BB‵, … on the same straight line are said to be in involution when the cross ratio of any four points whatever is equal to that of their conjugates.
page 86 note † This form of proof is adapted from Mulcahy’s Modern Geometry, §35.