Alan turing main contribution
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Alan Turing
English computer scientist (1912–1954)
"Turing" redirects here. For other uses, see Turing (disambiguation).
Alan Mathison Turing (; 23 June 1912 – 7 June 1954) was an English mathematician, computer scientist, logician, cryptanalyst, philosopher and theoretical biologist.[5] He was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation with the Turing machine, which can be considered a model of a general-purpose computer.[6][7][8] Turing is widely considered to be the father of theoretical computer science.[9]
Born in London, Turing was raised in southern England. He graduated from King's College, Cambridge, and in 1938, earned a doctorate degree from Princeton University. During World War II, Turing worked for the Government Code and Cypher School at Bletchley Park, Britain's codebreaking centre that produced Ultra intelligence. He led Hut 8, the section responsible for German naval cryptanalysis. Turing devised techniq
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Born June 23: Alan Turing
Alan Turing was born June 23, 1912, in London. He was an extraordinary man well ahead of his time, who was recognized early on as a genius by his peers. Only recently have his pioneering achievements in mathematical logic, cryptanalysis, computer science, artificial intelligence, and biology began to find widespread appreciation, many of which were foundational to the digital revolution that computerized our contemporary world. Turing is also remembered as a martyr to the struggle for LGBTQIA rights: after a series of influential publications and years of innovative codebreaking work crucial to the Allies’ defeat of Nazi Germany, he was prosecuted by the British government in 1952 for admitting a homosexual relationship and subjected to chemical castration, leading shortly to his depression and suicide. For decades after that, few apart from mathematicians and computer scientists knew much at all about Turing, his military codebreaking work having been classified. Andrew Hodges’ excellent 1983 biography brought Turing out of the shadows, with readable ex
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Turing's proof
Proof by Alan Turing
Turing's proof is a proof by Alan Turing, first published in November 1936[1] with the title "On Computable Numbers, with an Application to the Entscheidungsproblem". It was the second proof (after Church's theorem) of the negation of Hilbert's Entscheidungsproblem; that is, the conjecture that some purely mathematical yes–no questions can never be answered by computation; more technically, that some decision problems are "undecidable" in the sense that there is no single algorithm that infallibly gives a correct "yes" or "no" answer to each instance of the problem. In Turing's own words: "what I shall prove is quite different from the well-known results of Gödel ... I shall now show that there is no general method which tells whether a given formula U is provable in K [Principia Mathematica]".
Turing followed this proof with two others. The second and third both rely on the first. All rely on his development of typewriter-like "computing machines" that obey a simple set of rules and his subsequent development of a "un
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