The Thought That Built the Machine: How Alan Turing Imagined the Computer Before It Existed
In 1936, twenty-four-year-old Alan Turing published a dense mathematical paper titled “On Computable Numbers, with an Application to the Entscheidungsproblem.” There were no computers then — not even the concept of “software.” What he proposed was not a device, but an idea so radical that it redrew the boundaries between mathematics,