Henri Lebesgue
was born 142 years ago
28th June 1875

Henri Lebesgue formulated the theory of measure in 1901 and the following year he gave the definition of the Lebesgue integral that generalises the notion of the Riemann integral.

Find out more at:
http://www-history.mcs.st-andrews.ac.uk/Mathematicians/Lebesgue.html