math events By Sarah Fritchman 1525 The square root symbol is introduced for square roota 1639 Pascal discovers his theorem while only 16 years old 1641 Torricelli's Trumpet is discovered by Evangelista Torricelli 1665 Newton and Leibniz take the first steps in calculus 1706 William Jones introduces the sybol for pi 1718 Euler first uses the sybol i to represent the square root of -1 1761 Lambert proves that pi is irrational 1777 Comte de Buffon uses a needle to estimate the value of pi 1801 Joseph Huddart invents the three armed protractor 1831 Factorial notation n! is introduced by French mathematician Christian Kramp 1832 the mobius function is introduced https://www.youtube.com/watch?v=0z1fIsUNhO4 1844 Morse transmits the first message using his code https://www.youtube.com/watch?v=_J8YcQETyTw 1858 Emile Borel introduces the concept of normal numbers as a way to characterize the digits of pi 1879 the first cash register is invented by James Ritty 1882 the klein bottle is first described 1888 Galton introduces correlation https://www.youtube.com/watch?v=qC9_mohleao 1899 Pick's theorem is presented https://www.youtube.com/watch?v=XaviJAIZoss 1912 The hairy ball theorem is first proved https://www.youtube.com/watch?v=H9grHQDsIz8 1936 The fields medal is first awarded 1939 Richard von Mises proposes the birthday problem 1963 the ulam spiral is discovered 1967 The game of sprouts is discovered 1971 the worlds largest superegg is placed outside Kelvin Haill in Glasgow 1972 Hewlet- Packard introduces the dirst scientific pocket calculator 1974 Rubik's cube cube is invented 1979 Sudoku- like games are introduced in the US 1999 the eternity puzzle s released commercially 2005 numb3rs hits american telivision
