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Mathematical Notes

Published online by Cambridge University Press:  03 November 2016

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The Mathematical Gazette , Volume 1 , Issue 10 , February 1897 , pp. 81 - 87
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Copyright © Mathematical Association 1897

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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.