# Alan Turing (1912-1954)

Alan Turing (1912-1954) was a person who was a mathematician, logician, cryptanalyst, and computer scientist.

**AKA:**Alan Mathison Turing.**Context:**- Research Topics: Turing Machines.
- They can be a Theoretical Computer Scientist, Mathematician, Logician, Cryptanalyst, ...
- They can have invented a Turing Test.
- …

**Counter-Example(s):****See:**Computer Scientist, Turing Complete, Church-Turing Thesis, Entscheidungsproblem.

## References

### 2021a

- (Wikidata, 2021) ⇒ http://www.wikidata.org/wiki/Q7251 Retrieved:2021-12-10.
- QUOTE: British mathematician, logician, cryptanalyst, and computer scientist.

### 2021

- (Wikipedia, 2021) ⇒ https://en.wikipedia.org/wiki/Alan_Turing Retrieved:2021-12-10.
**Alan Mathison Turing**(23 June 1912 – 7 June 1954) was an English mathematician, computer scientist, logician, cryptanalyst, philosopher, and theoretical biologist. Turing 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. Turing is widely considered to be the father of theoretical computer science and artificial intelligence. Born in Maida Vale, London, Turing was raised in southern England. He graduated at King's College, Cambridge, with a degree in mathematics. Whilst he was a fellow at Cambridge, he published a proof demonstrating that some purely mathematical yes–no questions can never be answered by computation and defined a Turing machine, and went on to prove the halting problem for Turing machines is undecidable. In 1938, he obtained his PhD from the Department of Mathematics at Princeton University. During the Second World War, Turing worked for the Government Code and Cypher School (GC&CS) at Bletchley Park, Britain's codebreaking centre that produced Ultra intelligence. For a time he led Hut 8, the section that was responsible for German naval cryptanalysis. Here, he devised a number of techniques for speeding the breaking of German ciphers, including improvements to the pre-war Polish bombe method, an electromechanical machine that could find settings for the Enigma machine. Turing played a crucial role in cracking intercepted coded messages that enabled the Allies to defeat the Axis powers in many crucial engagements, including the Battle of the Atlantic.^{[1]}After the war, Turing worked at the National Physical Laboratory, where he designed the Automatic Computing Engine (ACE), one of the first designs for a stored-program computer. In 1948, Turing joined Max Newman's Computing Machine Laboratory, at the Victoria University of Manchester, where he helped develop the Manchester computers and became interested in mathematical biology. He wrote a paper on the chemical basis of morphogenesisand predicted oscillating chemical reactions such as the Belousov–Zhabotinsky reaction, first observed in the 1960s. Despite these accomplishments, he was never fully recognised in his home country during his lifetime because much of his work was covered by the Official Secrets Act.^{[2]}Turing was prosecuted in 1952 for homosexual acts. He accepted chemical castration treatment, with DES, as an alternative to prison. Turing died in 1954, 16 days before his 42nd birthday, from cyanide poisoning. An inquest determined his death as a suicide, but it has been noted that the known evidence is also consistent with accidental poisoning. In 2009, following an Internet campaign, British Prime Minister Gordon Brown made an official public apology on behalf of the British government for "the appalling way he was treated". Queen Elizabeth II granted Turing a posthumous pardon in 2013. The "Alan Turing law" is now an informal term for a 2017 law in the United Kingdom that retroactively pardoned men cautioned or convicted under historical legislation that outlawed homosexual acts. Turing has an extensive legacy with statues of him and many things named after him, including an annual award for computer science innovations. He appears on the current Bank of England £50 note, which was released to coincide with his birthday. A 2019 BBC series, as voted by the audience, named him the greatest person of the 20th century.

- ↑ A number of sources state that Winston Churchill said that Turing made the single biggest contribution to Allied victory in the war against Nazi Germany. However, both The Churchill Centre and Turing's biographer Andrew Hodges have stated they know of no documentary evidence to support this claim, nor of the date or context in which Churchill supposedly said it, and the Churchill Centre lists it among their Churchill 'Myths', see and A BBC News profile piece that repeated the Churchill claim has subsequently been amended to say there is no evidence for it. See Official war historian Harry Hinsley estimated that this work shortened the war in Europe by more than two years but added the caveat that this did not account for the use of the atomic bomb and other eventualities.Transcript of a lecture given on Tuesday 19 October 1993 at Cambridge University
- ↑ Olinick, M. (2021). Simply Turing. United States: Simply Charly, ch. 15.

### 1950

- (Turing, 1950) ⇒ Alan M. Turing. (1950). “Computing Machinery and Intelligence." Mind, 59.

### 1936

- (Turing, 1936) ⇒ Alan M. Turing. (1936). “On Computable Numbers, with an Application to the Entscheidungsproblem.” In: Proceedings of the London Mathematical Society, 2(42). doi:10.1112/plms/s2-42.1.230.