In the 19th century, Charles Hermite found a proof that requires no prerequisite knowledge beyond basic calculus.Two simplifications of Hermite's proof are due to Mary Cartwright and to Bourbaki.
In the 19th century, Charles Hermite found a proof that requires no prerequisite knowledge beyond basic calculus. Three simplifications of Hermite's proof are due to Mary Cartwright, to Ivan Niven and to Bourbaki.