Yale Straight Un! Monday, 14th Sep, 2015 by Krilling for Company in √2, Geometry, History, Irrational numbers, Mathematics, Square root of 2 and tagged ancient Babylon, Babylonian math, Babylonian mathematics, Babylonian maths, clay, cuneiform, diagonal of a square, irrational numbers, math, mathematics, maths, Pythagoras' theorem, square root of 2, square root of two, Square Roots, Yale Babylonian Collection, Yale University, YBC 7289 | Leave a comment Yale tablet, YBC 7289, c. 1700 BC.