I think that, as , a very clever young Israeli mathematician, once said, "I am an opportunist. I do what I can do." If there is anything in number th… - Paul Erdős

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I think that, as , a very clever young Israeli mathematician, once said, "I am an opportunist. I do what I can do." If there is anything in number theory that I can do, I certainly do it. But you see some of the problems in number theory are enormously difficult and many of these classic problems are very, very hard to make any progress in.