Barrow, Isaac, 1630-1677, Child, J. M. (James Mark), tr · Chicago, London : The Open court publishing company · leaf 146
. GH ;for this sum, where commas are usedbetween the quantities instead of a plussign, does not stand for the area ABKJ, but for R . ABKJ,where an ordinate HG is such that R . HG = HG . FH,and R is some given length; in other words, ordinatesproportional to each of the rectangles are applied to… … 126 BARROWS GEOMETRICAL LECTURES Thus, in § 3 of this lecture, the sum of AZ . AE^ BZ . BF^,CZ.CG^ etc., is the area aggregated from ordinatesproportional to AZ . AE^, BZ . BF^, CZ. CG^, etc., appliedto the line VD; and it is of the fourth dimension.Whereas, in § 3, the sum HL . HO2+LK . LY^H-Kl .…
Geometry
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