William Alvin Howard (born 1926) is a proof theorist best known for his work demonstrating formal similarity between intuitionistic logic and the simply typed lambda calculus that has come to be known as the Curry–Howard correspondence. He has also been active in the theory of proof-theoretic ordinals. He earned his Ph.D. at the University of Chicago in 1956, where he was a student of Saunders Mac Lane.
The Howard ordinal (also known as the Bachmann–Howard ordinal) was named after him.
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“The laboring man and the trade-unionist, if I understand him, asks only equality before the law. Class legislation and unequal privilege, though expressly in his favor, will in the end work no benefit to him or to society.”
—William Howard Taft (1857–1930)