An elementary treatise on modern pure geometry (1893)
Lachlan, Robert · London, New York, Macmillan and Co. · leaf 287
by any two equicross ranges,and let 0, 0 be any two points on the line AA, then the linesOB, OC, OD vfill intersect the lines OB, OC, CD, respectively,in collinear points. … Let OB, OC meet CF, CC, in B, C; and let BC meet AAin A. Let OD, CD meet FC in D, D, respectively. HOMOGRAPHIC RANGES. 271 Then we have {AB, CB} = [AS, CD}, and [AB, CD] = {AB, CIX]. But, by hypothesis, {AB, CD} = {AB, CD}. Therefore [AB, CD} = {AF, CD}. Hence, by § 421, the points D, D must…
Geometry
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