Did Einstein "derive" the field equation using the 5 postulates of GR, or did he guess what they had to be based on what the postulates implied? I ask this because I recall reading that the field equations published in his 1916 paper were those he had rejected around 1913. How could the final equations be "derived" if they were rejected earlier? The fact that he later adds the cosmological constant to satisfy a stable universe seems to suggest he was making guesses based on what he thought the postulates implied. AG
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