## The Outlines of Quaternions |

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### Common terms and phrases

angle-bisector arcs axis bisects centre Chemistry circle circumcentre coincides coinitial vectors collinear commutative commutative law conic conjugate consequently coplanar quaternions Crown 8vo definition differential diplanar equal equation expression geometric geometric meaning given gnomon Hence hyperbola incentre indefinite straight line intersection length Let OA locus mean point midcentre Multiplying null vector OABC OC OA operation opposite orthocentre parabola parallel vectors parallelogram parallelopiped perpendicular plane AOB positive or negative quadrant quotient ratio reciprocal represents right quaternion right versors rotation round scalar Section sides Similarly sphere square roots SqYr SrYq symbols tangent tensor term three coinitial three vectors triangle ABC unit-vector vector-arcs versor which turns Woodcuts YqYr zero

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