Person: Bertrand, Joseph Louis François


Joseph 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.

Mathematical Profile (Excerpt):

Born 11 March 1822, Paris, France. Died 3 April 1900, Paris, France.

View full biography at MacTutor

Astronomy, Group Theory, Knot Theory, Number Theory, Physics, Puzzles And Problems, Special Numbers And Numerals

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Adapted from other CC BY-SA 4.0 Sources:

  1. O’Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive