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Wilhelm Ackermann Biography
Wilhelm Ackermann (March 29, 1896 - December 24, 1962) was a mathematician and is most famous for the Ackermann function named after him, an important example in the theory of computation.

Ackermann was born on March 29, 1896 in Sch�nebecke (then Altena district, now part of Herscheid municipality), Germany, and received his doctoral degree in 1925 with his thesis Begr�ndung des "tertium non datur" mittels der Hilbertschen Theorie der Widerspruchsfreiheit, which was a consistency proof of arithmetic without induction. From 1929 until 1948 he taught at the Arnoldinum high-school in Burgsteinfurt, and afterwards till 1961 in L�denscheid. He was also a corresponding member of the Akademie der Wissenschaften (Academy of Sciences) in G�ttingen, and was an honorary professor at the Universit�t M�nster (Westphalia).

He wrote Grundz�ge der Theoretischen Logik (Fundamentals of the Theoretical Logic) with David Hilbert, dealing with Entscheidungsproblem and also constructed consistency proofs for set theory (1937), full arithmetic (1940), type-free logic (1952) and a new axiomatization of set theory (1956). He wrote the book Solvable cases of the decision problem (North Holland, 1954).

Wilhelm Ackermann died in L�denscheid, Germany on December 24, 1962.
 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article Wilhelm Ackermann.