= Alan Turing
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<Alan Turing> developed a precise machine model of effective computation in <On Computable Numbers, with an Application to the Entscheidungsproblem by Alan Turing>. A <Turing machine> combines a finite set of control states with an unbounded tape and local read/write moves; this permits mathematical questions about what an <algorithm> can compute, rather than tying computation to one physical device. His universal-machine construction is foundational to <computability theory>.https://www.kings.cam.ac.uk/alan-mathison-turing-1912-54[King's College archival account, computable numbers and universal machine]{ref} His later <The chemical basis of morphogenesis by Alan Turing> connects <reaction–diffusion systems> with the formation of spatial patterns.
\Image[https://commons.wikimedia.org/wiki/Special:Redirect/file/Alan%20Turing%20portr%C3%A9.jpg?width=250]
{title=Portrait of <Alan Turing>}
{description=Unknown photographer; existing Commons crop by David Levy from Alan Turing az 1930-as években.jpg. Public domain in the UK under Commons' PD-UK-unknown statement; Commons flags possible US copyright restored under URAA. No worldwide free-license claim. Source and usage information on the linked Wikimedia file page.}
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