I want to know the answer to the following question:
What principal contribution did von Neumann make to atomic bomb?
All the background I'm provided with is that "While von Neumann did not originate the "implosion" concept, he was one of its most persistent proponents, encouraging its continued development against the instincts of many of his colleagues, who felt such a design to be unworkable.". Is that enough to answer the question?
Answer: no