TIL “1” wasn’t considered a number by Ancient Greeks (even Aristotle & Euclid). Numbers were *multitudes* of units (1 was the unit). “One is the seed of number but not number.” This view didn’t change til 1701 AD, when 1 was defined as a number in the first math dictionary: “Mathematicks Made Easie”

Read more: https://www.smithsonianmag.com/smart-news/one-number-according-mathematicks-made-easie-yes-180964318/

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