Pythagorean Theorem Found On Clay Tablet 1,000 Years Older Than Pythagoras
It predates Pythagoras by over 1,000 years.
A Babylonian tablet from around 1770 BC uses principles of the Pythagorean theorem, suggesting ancient Babylonians discovered it centuries before the famous Greek mathematician Pythagoras for whom it's named.
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The paper (linked from the article) has a photo of the actual tablet in question, which was apparently discovered circa 1900.