I want to know the answer to the following question:
What was the central theme of Godel's announcement that the axiomatic system was not complete?
All the background I'm provided with is that "With this contribution of von Neumann, the axiomatic system of the theory of sets became fully satisfactory, and the next question was whether or not it was also definitive, and not subject to improvement.". Is that enough to answer the question?
Answer: no