Pythagorean Theorem Found On Clay Tablet 1,000 Years Older Than Pythagoras
iflscience.com
Study math for long enough and you will likely have cursed Pythagoras's name, or said "praise be to Pythagoras" if you're a bit of a fan of triangles.
But while Pythagoras was an important historical figure in the development of mathematics, he did not figure out the equation most associated with him (a2 + b2 = c2). In fact, there is an ancient Babylonian tablet (by the catchy name of IM 67118) which uses the Pythagorean theorem to solve the length of a diagonal inside a rectangle. The tablet, likely used for teaching, dates from 1770 BCE – centuries before Pythagoras was born in around 570 BCE.
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Reminds me of the mediaeval nun who erased a manuscript by Archimedes who was laying out the basics of calculus long before it was formally "invented" by Newton and Leibnitz because she needed space to write prayers.
How do you erase a manuscript
It was on parchment I believe, it was pretty common in the middle ages to scrape the ink off those and reuse them.
For anyone interested, that's called a palimpsest.
This!