You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.

Paragraph- Sent 1: General relativity includes a dynamical spacetime, so it is difficult to see how to identify the conserved energy and momentum.
Sent 2: Noether's theorem allows these quantities to be determined from a Lagrangian with translation invariance, but general covariance makes translation invariance into something of a gauge symmetry.
Sent 3: The energy and momentum derived within general relativity by Noether's presecriptions do not make a real tensor for this reason.
Sent 4: Einstein argued that this is true for fundamental reasons, because the gravitational field could be made to vanish by a choice of coordinates.
Sent 5: He maintained that the non-covariant energy momentum pseudotensor was in fact the best description of the energy momentum distribution in a gravitational field.
Sent 6: This approach has been echoed by Lev Landau and Evgeny Lifshitz, and others, and has become standard.
Sent 7: The use of non-covariant objects like pseudotensors was heavily criticized in 1917 by Erwin Schrodinger and others.
Who's theory did not have a more precise symmetry for conserved energy and momentum?