Page:LorentzGravitation1916.djvu/29

 those presented in § 26 we see that in the new coordinates as well as in the original ones we have equations of the form (29).

Whatever be our choice of the coordinates the part of the principal function indicated in § 14 can therefore be derived for a given current vector $$\mathrm{q}$$.

In a sequel to this paper some conclusions that may be drawn from 's principle will be considered.