D O C . 9 E N E R G Y C O N S E RVAT I O N 7 7

publication of Einstein 1917b (Vol. 6, Doc. 43) (see Einstein 1918e [Doc. 4], note 17, for further

details).

[11]“Sinnenelement” should be “Linienelement.” In the Nachtrag (pp. 458–459), Einstein makes a

different coordinate choice.

[12]See, for example, Lorentz 1916, pp. 468 and 470.

[13]Weyl 1918b.

[14]“(18), (18a)” should be “(19), (19a).”

[15]This proof was provided the following year by Jakob Grommer (1879–1933) (see Jakob Grom-

mer to Einstein, 1 July 1919) and published as Grommer 1919.

[16]Einstein 1917b (Vol. 6, Doc. 43).

[17]“ ” on the left-hand side of eq. (24) should be “ .”

[18]This form of the line element for Einstein’s cosmological model can be found in Willem de Sit-

ter to Einstein, 20 March 1917 (Vol. 8, Doc. 313), and in De Sitter 1917a.

F3 cosnx2 F3 cosnx3