Exercise 6. Prove that the following functions are multiplicative.
(a) d(n)=#{dinN:d|n}
(b) 2^(omega (n)), where prime
Exercise 6. Prove that the following functions are multiplicative (a) d(n)=#{d e N:d|n} (b) 2w(n),where w(n)=#{p|n: p prime} J(-1)w(n)if n is squarefree, )u(n) otherwise