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Some of Britain's leading scientists have called on the government to grant a posthumous pardon to Bletchley Park codebreaker Alan Turing.
Turing was convicted of gross indecency in 1952 after acknowledging a sexual relationship with a man.
Professor Stephen Hawking, Astronomer Royal Lord Rees and the Royal Society's Sir Paul Nurse are among 11 signatories to a letter in the Daily Telegraph.
They urge David Cameron to "formally forgive this British hero".
The scientists said: "We write in support of a posthumous pardon for Alan Turing, one of the most brilliant mathematicians of the modern era.
"He led the team of Enigma codebreakers at Bletchley Park, which most historians agree shortened the Second World War.
"Yet successive governments seem incapable of forgiving his conviction for the then crime of being a homosexual, which led to his suicide, aged 41."
The government rejected a call to pardon Turing in February, when it was presented with an online petition with more than 23,000 signatures.
GCHQ director Iain Lobban has said there were "enduring lessons" to be drawn from the work of Alan Turing.
In a rare public speech the intelligence agency chief said there were "many parallels between the way we work now and the way we worked then".
Based at Bletchley Park, the mathematician was part of the team that cracked the Nazi Enigma code - a vital part of the allied war effort.
He is now widely recognised as a computing pioneer.
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"The fact that Turing was unashamedly gay was widely known to his immediate colleagues at Bletchley Park: it wasn't an issue," he said.
"I don't want to pretend that GCHQ was an organisation with twenty-first century values in the twentieth century, but it was at the most tolerant end of the cultural spectrum."
Later in his life Turing was convicted of gross indecency after an affair with another man. He was subsequently obliged to take injections of female hormones in an effort to dull his sex drive.
After his arrest he was no longer given an opportunity to carry out work for GCHQ.
Mr Lobban said "we should remember that the cost of intolerance towards Alan Turing was his loss to the nation".
Alan Turing was born on 23 June, 1912, in London. His father was in the Indian Civil Service and Turing's parents lived in India until his father's retirement in 1926. Turing and his brother stayed with friends and relatives in England. Turing studied mathematics at Cambridge University, and subsequently taught there, working in the burgeoning world of quantum mechanics. It was at Cambridge that he developed the proof which states that automatic computation cannot solve all mathematical problems. This concept, also known as the Turing machine, is considered the basis for the modern theory of computation.
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In 1952, Turing was arrested and tried for homosexuality, then a criminal offence. To avoid prison, he accepted injections of oestrogen for a year, which were intended to neutralise his libido. In that era, homosexuals were considered a security risk as they were open to blackmail. Turing's security clearance was withdrawn, meaning he could no longer work for GCHQ, the post-war successor to Bletchley Park.
He committed suicide on 7 June, 1954.
Alan Mathison Turing, OBE, FRS (play /ˈtjʊərɪŋ/ TEWR-ing; 23 June 1912 – 7 June 1954), was a British mathematician, logician, cryptanalyst, and computer scientist. He was highly influential in the development of computer science, giving a formalisation of the concepts of "algorithm" and "computation" with the Turing machine, which can be considered a model of a general purpose computer.[1][2][3] Turing is widely considered to be the father of computer science and artificial intelligence.[4]
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Since 1966, the Turing Award has been given annually by the Association for Computing Machinery for technical or theoretical contributions to the computing community. It is widely considered to be the computing world's highest honour, equivalent to the Nobel Prize.
The government rejected a call to pardon Turing in February, when it was presented with an online petition with more than 23,000 signatures.
Alan Turing, the Enigma codebreaker who was convicted of homosexuality in 1952, should receive a posthumous pardon, Professor Stephen Hawking and other leading scientists have urged.
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The letter describes Turing as "one of the most brilliant mathematicians of the modern era", and pays tribute to his "astonishing achievement" in breaking the German Enigma code.
"Yet successive governments seem incapable of forgiving his conviction for the then crime of being a homosexual," the letter continues. "We urge the prime minister to exercise his authority and formally forgive the iconic British hero."
In 2009 Gordon Brown, the then prime minister, made a posthumous apology to Turing, describing his treatment as "appalling". But he was not officially pardoned.
A previous appeal for a pardon was turned down by the Coalition in February. Lord McNally, the justice minister, said the case was "shocking" but a pardon was "not considered appropriate as Alan Turing was properly convicted of what at the time was a criminal offence".