What it means
A digital computer is designed to replicate any calculation or logical operation that a human being performing arithmetic could do by hand. The machine does not think differently from a person doing math with paper and pencil — it simply executes the same steps faster and without fatigue, replacing human computational labor with mechanical precision.
Relevance to Alan Turing
Turing formalized what computation means in his 1936 paper introducing the Turing Machine — an abstract model of a human clerk following rules. His wartime Bombe machines at Bletchley Park operationalized this: mechanical systems replacing human codebreakers. This quote directly echoes his foundational insight that machines can be universal executors of human reasoning steps.
The era
In the 1940s and 50s, 'computer' literally meant a person — typically a woman — who performed calculations by hand for military ballistics, census work, or scientific research. Early digital machines like ENIAC and the Manchester Mark 1 were sold as replacements for these human workers, making Turing's framing instantly relatable to audiences familiar with rooms full of human calculators.
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