%0 Journal Article %T A Page in Number Theory %A Andrea Asperti %A Cristian Armentano %J Journal of Formalized Reasoning %D 2008 %I University of Bologna %X We discuss the formalization, in the Matita Interactive Theorem Prover, of a few elementary results in number theory about the Moebius mu function and the Euler phi function. %K Matita %K Moebius mu function %K Euler phi function %U http://jfr.cib.unibo.it/article/view/385/726