The UPR can be changed to a SUDR or a TUDR, by a change in the "direction" of the progression of one of its two reciprocal aspects. Since both aspects of the UPR are increasing scalar quantities, the only possible change in this increasing "direction" is a change to a decreasing "direction;" that is, the scalar progression in either case can be a continuously alternating increase/decrease of quantity, as well as a continuously increasing quantity. When the progression of the space aspect is continuously increasing and decreasing, between two adjacent spatial locations in the progression, while the time aspect is continuously increasing, a unit displacement in the space/time progression ratio is created.
In other words, the equation of the UPR progression,
ds/dt = 1/1,
changes to the equation of unit displacement in space,
ds/dt = 1/2,
because the rate of change in the increase of the time aspect, is now twice the rate of change in the increase of the space aspect, due to the "direction" reversals in its progression.
In the LRC terminolgy, the new progression ratio, 1/2, created by this unit displacement, is referred to as the space unit dispalcement ratio, or SUDR, because it is created by continuous "direction" reversals in the space aspect of the UPR.
In other words, the equation of the UPR progression,
ds/dt = 1/1,
changes to the equation of unit displacement in space,
ds/dt = 1/2,
because the rate of change in the increase of the time aspect, is now twice the rate of change in the increase of the space aspect, due to the "direction" reversals in its progression.
In the LRC terminolgy, the new progression ratio, 1/2, created by this unit displacement, is referred to as the space unit dispalcement ratio, or SUDR, because it is created by continuous "direction" reversals in the space aspect of the UPR.