Barrow, Isaac, 1630-1677, Child, J. M. (James Mark), tr · Chicago, London : The Open court publishing company · leaf 35
the outcome of Barrows definition of a tangent^ whollyand solely; and the method of Fermat did not consider this. The mental picture that I form of Barrow, and of theevents that led to this discovery, amongst others far moreimportant, is that of the Professor of Geometry at GreshamCollege, who has… … Fig. A. Fig. B. course of his researches, he is led from one thing toanother until he comes to the paraboliform construction ofLect. IX, § 4, perceives its usefulness and inner meaning,and immediately conceives the idea of the differentialtriangle. I think if any reader compares the two…
Geometry
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