 The major terms in and are those that contain time [[derivative]]s. From and the space components of one has

resulting in

where 'const' are time-independent quantities.Additionally, from the identity "uiui" = 1 one has (because all covariant components of "u"α are to the same order)

where "un" is the velocity component along the direction of n that is connected with the highest (positive) power of "t" (supposing that "pn" = "p"3).From the above relations, it follows that
or

The above equations can be used to confirm that the components of the matter [[stress-energy-momentum tensor]] standing in the right hand side of the equations

are, indeed, to a lower order by 1/"t" than the major terms in their left hand sides.