Schubert, Hermann, 1848-1911, McCormack, Thomas J. (Thomas Joseph), 1865-1932 · Chicago, The Open court publishing company · leaf 97
n space which may bedenoted by the numbers 1, 2, 3, 4, 5 ; then imagine all the possibleten straight lines of junction drawn between each two of these points,namely, 1-2, 1-3 .... 4-5 ; and finally, also, all the ten planes ofjunction of every three points described, namely, the plane 1-2-3,1-2-4,… … Fig. 36. IHE FOURTH DIMENSION. 87 Thus, for example, on this plane the points 1-2, 1-3, and 2-3 will lie ina straight line, for through the three spatial points i, 2, 3, a plane canbe drawn which will cut the plane of a drawing in a straight line.The reason, therefore, that the three points 3-4,…
