The book An Elementary Treatise On Quaternions was written by author Peter Guthrie Tait Here you can read free online of An Elementary Treatise On Quaternions book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Elementary Treatise On Quaternions a good or bad book?
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Eliminating the first power of r, we evidently must obtain a result such as (|O-e)He^ + r-'' = 0, where (by what precedes) e is the vector of the centre, and e the radius, of a fixed sphere (p - if + e^ = 0, which is cut at right angles by all the varying spheres. By effect- ing the elimination exactly we easily find e and e in terms of given quantities. 247. If two vectors divide one another into parts a and — ea, p and -p, respectively, the lines joining the free ends meet in (1 + e) p - lea.... CT= . 1 — e We may write this as e,p = CT + aj, ■f 1 + e 2ea " e, = , a = : 1-e' ^ 1-, 247-] THE SPHERE AND CYCLIC CONE. 187 For another such pair of vectors, passing through the same point, we have, say, /^or = ^ + /3,. Thus the plane quadrilateral, whose diagonals are made up respectively of the complete a and ^ vectors, will be projected (by lines from the point ■bt) as a square on the plane of p, a; provided Tp=TS.(^ + aJ(tT + ^J=0 (2).
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