Stephen Cole Kleene (
January 5,
1909,
Hartford, Connecticut,
USA –
January 25,
1994,
Madison, Wisconsin) was an
American mathematician who helped lay the foundations for theoretical
computer science. One of many distinguished students of
Alonzo Church, Kleene, along with
Alan Turing,
Emil Post, and others, is best known as a founder of the branch of
mathematical logic known as
recursion theory. Kleene's work grounds the study of which functions are
computable. A number of mathematical concepts are named after him:
Kleene hierarchy,
Kleene algebra, the
Kleene star,
Kleene's recursion theorem and the
Kleene fixpoint theorem. He also invented
regular expressions, and was a leading American advocate of
mathematical intuitionism.
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