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ds' = ds, or, in general, dsm = dsn
(6)

Con-space area:
(6a)
or, in general,
(7)

Con-space volume (V):
(7a)
v' = v or, in general, vm = vn
To precede possible misunderstanding , the meaning of the speed v or v' is the following:
1. When a body is moving at a speed v in the unprimed frame, the observer from the primed frame can perform the measurement of this speed (not the resultant speed) by the instruments breathing with the spacetime : In both cases the measurement shows the same magnitude of the speed, now designated as v'.
2. If a body was moving at a speed v' in the primed frame, and the observer from the unprimed frame performed the similar measurement of the speed v, he would find out, that v' = v as well.
The speed in a frame M, measured by the instruments not breathing with space and time and calibrated for the time and length units of the N frame, may be expressed :
(8)

and the con-spacetime speed calculated from con-spacetime length and time is defined by equation (5c).
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