Smart, Edward Howard · London : Macmillian and Co. · leaf 206
ions of P near A, the curves would coincide in that neighbourhood, and their curvatures would be the same. We shall therefore not be inconsistent if we define the ratio of the curvatures of the curves at A in the general case PQ,as the limiting value of the ratio when P moves up to A. Pq Consider… … (a)
Geometry, Projective
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