That everywhere space (which [in its entirety] is itself no longer the boundary of another space) has three dimensions, and that space cannot in any way have more, is based on the proposition that not more than three lines can intersect at right angles in one point;
Ezen espazio perfektuak (beste inolako espazioren muga ez denak) hiru dimentsio dituela eta espazioak oro har ezin duela beste dimentsiorik eduki, zerako proposizioaren gainean eraikitzen da, alegia puntu batean ezin dutela angelu zuzenean hiru lerrok baino gehiagok elkar ebaki;