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angle application axes axis becomes centre Chapter circle condition cone conjugate constant contains course curvature curve depends determine differential direction distance drawn easily effect element Eliminating ellipsoid employed envelop equal equation equivalent evidently example expression extremity fact factors fixed forces formula function given gives Hamilton Hence integral intersection involves joining length linear and vector locus means meet multiplied normal obtain obviously once operating origin parallel particular pass perpendicular plane position proof properties prove quaternion radius rectangular referred represents respectively result right angles rotation S.aßy Saß satisfied scalar second order seen shew sides similar Similarly simple solution space sphere spherical student suppose surface tangent plane tensor theorem tion transformation triangle unit-vector Vaß vector vector function versor write written
Page 138 - The locus of the middle points of a system of parallel chords in a parabola is called a diameter.