Bohun, C. SeanPerry, G. Phillip2010-04-152010-04-1519922010-04-15http://hdl.handle.net/1828/2610We illustrate how the Ehlers' formal mathematical definition of the Newtonian limit requires additional information to successfully determine the Newtonian limit. This information can be obtained through the physical arguments of Cooperstock's definition. We show that Ehlers' formalism is equivalent to Cooperstock's derivation of the Newtonian limit when the physical arguments are included in the former definition.enTechnical Report