## An Elementary Treatise on Quaternions |

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angle application axes axis becomes centre Chapter circle condition cone conjugate constant contains course curvature curve definite determine differential direction distance drawn easily element Eliminating ellipsoid envelop equal equation equivalent evidently example expression extremity fact factors fixed formula function given gives Hamilton Hence integral intersection involves length linear and vector locus means meet multiplied normal obtain obviously once operating origin parallel pass perpendicular plane position proof properties prove quaternion radius rectangular referred represents respectively result right angles rotation Saß satisfied scalar second order seen shew sides similar Similarly simple solution sphere spherical student suppose surface tangent plane tensor theorem tion transformation triangle unit-vector vector vector function versor write written