Alan Turing — "It is possible to invent a single machine which can be used to compute any compu…"
It is possible to invent a single machine which can be used to compute any computable sequence.
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More from Alan Turing
"The machine has a definite state at any moment, which is determined by the instructions it has received and by the results of its previous operations."
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Details
From his paper 'On Computable Numbers, with an Application to the Entscheidungsproblem'.
Date: 1936
PhilosophicalVerification
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Understanding this quote
What it means
Any calculation that can be defined by a finite set of rules can be performed by one universal machine — you don't need a separate device for each task. This single insight underpins every general-purpose computer ever built: one machine, infinite problems, all solvable through the right instructions.
Relevance to Alan Turing
Turing published this in his landmark 1936 paper introducing the theoretical 'Turing machine.' A mathematician who broke the Enigma cipher at Bletchley Park, he spent his life proving that intelligence and computation are formalizable. This quote captures his core conviction: thinking itself might be mechanized, a belief that defined his entire career.
The era
In the 1930s, 'computers' were human clerks doing arithmetic by hand. No electronic computers existed. Turing wrote this during a foundational crisis in mathematics triggered by Gödel and Hilbert. His theoretical machine resolved key questions about what is provably computable, arriving just before WWII would demand exactly the mechanical codebreaking he had already imagined.
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