From the history of maths
Alan Turing
His 1936 paper on computable numbers described the Turing machine, the idea behind every computer.
He led codebreaking work on Enigma at Bletchley Park, and appears on the Bank of England £50 note.
Elliott & Fry, Public domain, via Wikimedia Commons
Where you’ll meet Turing here
Logic
They turn up beside problems and lessons on these topics.
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George Boole
Largely self-taught, he turned logic into algebra in The Laws of Thought (1854).
Every digital circuit runs on his true-and-false arithmetic. He was the first professor of mathematics at Queen’s College, Cork.
Unknown author, Public domain, via Wikimedia Commons