* "Arithmetices principia, nova methodo exposita" (1889): This book introduced Peano's axioms, a set of axioms for natural numbers that are still used today in foundational mathematics.
* "Formulaire de mathématiques" (1894-1908): This was a multi-volume work that aimed to create a formal language for mathematics, using a system of symbols and notation.
* "Calcolo geometrico secondo l'Ausdehnungslehre di H. Grassmann preceduto dalle operazioni della logica dedutiva" (1888): This work explored the use of geometric calculus, based on the work of Hermann Grassmann.
* "Lezioni di analisi infinitesimale" (1893): A textbook on infinitesimal calculus that introduced Peano's concept of a "curve" and his definition of a "continuous function".
Peano also wrote numerous articles and papers on various mathematical topics, including logic, set theory, and the foundations of mathematics.
If you are interested in learning more about Peano's work, I suggest looking for resources online or in libraries.