I want to know the answer to the following question:
What work did Von Nemann do in Berlin in 1930 and Princeton 1935 - 39?
All the background I'm provided with is that "In a short list of facts about his life he submitted to the National Academy of Sciences, he stated "The part of my work I consider most essential is that on quantum mechanics, which developed in Göttingen in 1926, and subsequently in Berlin in 1927–1929.". Is that enough to answer the question?
Answer: no