[1] The model is of historic significance as the first scientific publication in which Einstein embraced the possibility of a cosmos of time-varying radius.
Interpreting Edwin Hubble's discovery of a linear relation between the redshifts of the galaxies and their radial distance[2] as evidence for an expanding universe, Einstein abandoned his earlier static model of the universe and embraced the dynamic cosmology of Alexander Friedmann.
[3][4] In the model, Einstein derived simple expressions relating the density of matter, the radius of the universe and the timespan of the expansion to the Hubble constant.
It has recently been shown that these calculations contain a slight systematic error.
It has been suggested[5] that the source of the numerical errors in the Friedmann–Einstein model can be discerned on Einstein's blackboard.