The Meaning of Relativity / Four lectures delivered at Princeton University, May, 1921

by Albert Einstein

and for which the first derivatives of the

and the

vanish. We shall verify the vanishing of the divergence of the left-hand side at this point. At this point the components

vanish, so that we have to prove the vanishing only of

Introducing (88) and (70) into this expression, we see that the only terms that remain are those in which third derivatives of the