In: Advanced Math
We define the Liouville function λ(n) by setting λ(1)=1. If n>1, we consider the prime power factorization n=p_1^(a_1 ) p_2^(a_2 )…p_m^(a_m ) and define λ(n)=(-1)^(a_1+a_2+⋯+a_m ) Prove that the summatory function of λ,Λ(n)=∑_d|n┤▒〖λ(d)〗 is multiplicative.