Where do math symbols come from? - John David Walters
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More information about the life of Robert Recorde can be found at the MacTutor History of Mathematics archive.
Part of the inspiration for this lesson came from Richard Feynman’s fascinating anecdote about inventing his own mathematical notation in high school. It is found in one of his essays, titled “He Fixes Radios by Thinking!” collected in Surely You’re Joking, Mr. Feynman.
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