D O C . 5 1 N O T E T O F R I E D M A N N 4 7
51. “Note to the Paper by A. Friedmann ‘On the
Curvature of Space’”
Received 31 May 1923
Published June–July 1923
In: Zeitschrift für Physik 16 (1923): 228.
In an earlier note
I exercised criticism on the mentioned paper.
however, was based on a calculation error—as I have become persuaded, at the sug-
gestion of Mr. Krutkoff, guided by a letter by Mr. Friedmann. I consider Mr.
Friedmann’s results correct and illuminating. It is demonstrated that the field
equations permit, aside from the static solution, dynamic (i.e., variable with the
time coordinate), centrally symmetrical solutions for the structure of space.
Z[eit]s[chrift] f[ür] Phys[ik], [vol.] 11, [p.] 326, 1922.
Ibidem, [vol.] 10, [p.] 377, 1922.