An elementary treatise on coordinate geometry of three dimensions (1912)
Bell, Robert J. T. (Robert John Tainsh), 1877-1963 · London : Macmillan and co., limited · leaf 305
he osculating plane of the curve of intersection of the first twois given by X3/(a* + fl) | y/(62 + /x) , zz(c2 + [x)_1 -+- -+- aa(a2 + A) b2(b2 + k) c2(c2 + X) Ex. 4. Prove that the points of the curve of intersection of thesphere and conicoid rx2 + ry2 + rz2 = l, ax2 + by2 + cz2 = l,at which the… … Fig. 54. on it, and their locus is the normal plane at A. Two of thenormals are of special importance, that which lies in theosculating plane at A and is called the principal normal, and §193] PRINCIPAL NORMAL AND BINORMAL that which is perpendicular bo the osculating plane and isCalled the…
Geometry, Analytic
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