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J. Barkley RosserJohn Barkley Rosser Sr. (1907-1989) was an American logician, a student of Alonzo Church, and known for his part in the Church-Rosser theorem, in lambda calculus. He also developed what is now called the Rosser sieve, in number theory. He was later Director of the Army Mathematics Research Center at the University of Wisconsin-Madison. He also wrote mathematical textbooks. In 1936, he proved a stronger version of Gdel's first incompleteness theorem, showing that the requirement for -consistency may be weakened to consistency. Rather than using the liar paradox sentence equivalent to "I am not provable," he used a sentence that stated "For every proof of me, there is a shorter proof of my negation". John Barkley Rosser Jr. is known as a mathematical economist. External link Barkley Rosser papers Rosser, J. Barkley Rosser, J. Barkley
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