On the possible numbers of operators of order 2 in a group of order 2^{đť‘š}
G. A. Miller · Bulletin of the American Mathematical Society · 1905
Incidentally, the value of p obtained in (9) shows that the torsion, unlike the curvature, is independent of v.An arbitrary field of force (1) produces oo 5 trajectories, of which oo 1 pass through a given point in a given direction.These oo 1 trajectories have, at the given point, a common osculating plane and a common torsion.The locus of centers of their osculating spheres is a straight line.Thus every field of force gives rise to a correspondence between the direction elements and the straight lines of space,