, of which point-tracks are the points and matrices include the straight lines. This is the space of physical science.
There is an exact correlation between the time-less space of a time-system and any momentary space of the same time-system. For any point of the momentary space is an event-particle which occupies one and only one point of the time-less space; and any straight line of the momentary space is a rect which lies in one associated matrix including one straight line of the time-less space, or (in other words) each straight line of the momentary space occupies a straight line of the time-less space.
A time-system corresponds to a consentient set of the Newtonian group, and the time-less space of the time-system is the space of the corresponding consentient group.
[CHAPTER XII]
NORMALITY AND CONGRUENCE
[47. Normality]. [47.1] A point-track will be said to be 'normal' to the moments of the time-system in the space of which it is a point.
A matrix is said to be 'normal' to the moments which are normal to any of the point-tracks which it contains.
Consider an event-particle
and a matrix
