 | Charles Jasper Joly - Quaternions - 1905 - 356 pages
...= Sp-\</> — l)p ........................... (n.) is called the elongation, and it is numerically equal to the reciprocal of the square of the radius of the elongation quadric l)P= -1, (tf>o=K0 + <£')), ............ (in.) which is parallel to the vector p.... | |
 | Royal Society (Great Britain) - Mathematics - 1887 - 556 pages
...reciprocals of the squares of the tangents from the points of intersection of four spheres to the spheres is equal to the reciprocal of the square of the radius of the sphere which cuts them orthogonally. Again, from equation (228), """tl _j_ '"'*, 2 _,_ 71'J.3 _,_ ""X... | |
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... is equal to the reciprocal of the square of the radius of the sphere which cuts them orthogonally. 