Mathematicians Of The Day

29th April

On this day in 1901, Lebesgue published his famous paper Sur une généralisation de l'intégrale définie in the Comptes Rendus of the French Academy of Sciences. In this he gave the definition of the Lebesgue integral that generalises the notion of the Riemann integral by extending the concept of the area below a curve to include many discontinuous functions.

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Quotation of the day

From Ludwig Wittgenstein
There can never be surprises in logic.
Quoted in J R Newman, The World of Mathematics (New York 1956).