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ruzuzu commented on the word vector of the quaternion

From the

Century Dictionarydefinition for vector:"In quaternions, a quantity which, being added to any point of space, gives as the sum that point which is at a certain distance in a certain direction from the first. Vectors are said to be equal when their directions and magnitudes are the same. Unit vectors in quaternions are considered as equivalent to quadrantal versors having their axes in the directions of vectors; the word

vectorhas accordingly sometimes, but incorrectly, been used in the sense of a quadrantal versor. Every quaternion can be resolved in one way, and one way only, into a sum of a scalar and a vector; and this vector is called thevector of the quaternion, and is denoted by writing V before the sign of the quaternion. Thus, Vq denotes the vector of the quaternion q."August 11, 2010