Joseph Louis François Bertrand (1822 - 1900)

* 11 March 1822, † 3 April 1900

Joseph Louis François Bertrand was born on 11 March 1822 in Paris, France. Bertrand was a Paris professor who, in 1845, conjectured:I’ve told you once and I’ll tell you again There’s always a prime between n and 2n.This was proved by Chebyshev in 1850. Joseph Louis François Bertrand died on 3 April 1900 in Paris, France.