J. Barkley Rosser

John 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. Rosser wrote mathematical textbooks as well.

In 1936, he proved Rosser's trick, a stronger version of Gödel's first incompleteness theorem which shows that the requirement for ω-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".

In prime number theory, he proved Rosser's theorem.

The Kleene–Rosser paradox showed that the original lambda calculus was inconsistent.

Rosser's son, John Barkley Rosser, Jr., is a mathematical economist and professor at James Madison University in Harrisonburg, Virginia.

Writings by Rosser

• A mathematical logic without variables by John Barkley Rosser, Univ. Diss. Princeton, NJ 1934, p. 127-150, 328-355
• Logic for mathematicians by John B. Rosser, 2nd ed., Chelsea Publ. Co. 1978, 578 p., ISBN 0-8284-0294-9
• Highlight of the History of Lambda calculus, by J. Barkley Rosser, Annals of the History of Computing, 1984, vol 6, n 4, pp. 337-349
• See Barkley Rosser papers for a complete list of Rosser's publications.

External links

• J. Barkley Rosser at the Mathematics Genealogy Project
• Interview with Rosser and Stephen Kleene about their experiences at Princeton

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