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When the interests of Erdos's colleagues drifted away from pure mathematics, he made no secret of his disapproval. "When I wasn't sure whether to stay a mathematician or go to the Technical University and become an engineer, Vazsonyi recalled, "Erdos warned me:
'I'll hide, and when you enter the Technical University, I will shoot you.' That settled the matter."
When probability theorist Mark Kac had a paper published in the Journal if Applied Physics based on his work during the war at MIT's Radiation Laboratory, Erdos sent him a one sentence postcard: "I am praying for your soul." Erdos was "reminding me," Kac said, "that I might be straying from the path of true virtue, which, as a matter of fact, I was.
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Paul Hoffman (The Man Who Loved Only Numbers: The Story of Paul Erdős and the Search for Mathematical Truth)