article_snippet.sent: A handwritten book containing notes and calculations made by Alan Turing while Alan Turing worked on decoding Enigma  has been sold at auction for £700,000.
article_snippet.sent: The 56-page document, believed to be the only extensive Alan Turing manuscript in existence, was written in 1942 at the Government Code and Cypher School at Bletchley Park, in Buckinghamshire.
article_snippet.sent: The notebook, in which he details he work on the foundations of mathematical notation and computer science, was sold for $1,025,000 (£698,000) in a Fine Books & Manuscripts Sale at Bonhams in New York on Monday.
article_snippet.sent: Alan Turing wrote the notes at the Bletchley Park code-breaking headquarters in 1942 and they paved the way for computer science.
article_snippet.sent: the notes at the Bletchley Park code-breaking headquarters are believed to be the only extensive Alan Turing manuscript (right) known to exist, auctioneer said .
article_snippet.sent: A handwritten notebook in which Britain's Enigma machine genius Alan Turing admits Alan Turing is baffled by an equation could fetch up to $1million (£690,000).
highlights_snippet.sent: Notebook written by Alan Turing during World War II sold for £700,000 .
  
highlights_snippet.sent: It was written at the Bletchley Park code-breaking headquarters in 1942 .
  
highlights_snippet.sent: Only extensive Alan Turing manuscript thought to exist, auctioneer said .