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Giuseppe Peano

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Giuseppe Peano (1858--1932) es mathematico italiano famoso per suo axioma de arithmetica et per suo lingua internationale: latino sine flexione.

Peano es auctore de Formulario mathematico.

Functione de plure variabile

Peano da exemplo que seque ut proba que functione pote habe derivato partiale que non commuta[1]: f: R2R tale que f(x, y) = xy (x2 - y2)/(x2 + y2) si (x, y) ≠ (0, 0) et f(0, 0) = 0.


  1. les maths en tête ANALYSE, 2e édition, Xavier Gourdon, 2008