question: What was the central theme of Godel 's announcement that the axiomatic system was not complete ?
answer: they can not prove every truth which is expressible in their language
turker_answer: The central theme of Godel 's announcement that the axiomatic system was not complete was they can not prove every truth which is expressible in their language .
rule-based: The central theme of Godel 's announcement that the axiomatic system was not complete was they can not prove every truth which is expressible in their language .