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The Anharmonic Ratios of 4 points in a straight line
Published online by Cambridge University Press: 20 January 2009
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The anharmonic ratio of four points A, B, C, D depends on the order in which they are taken. The A.I.G.T. “Syllabus,” following Cremona, defines the symbol (ABCD) to stand for 
, when A is conjugate to B and C to D. Thus, taking λ to denote the value of this double-ratio, we have
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- Copyright © Edinburgh Mathematical Society 1909
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