=+3.2. Let P be a probability measure on a field Fo and for every subset A of 22 define P*( A) by (3.1). Denote also by P the extension (Theorem 3.1) of P to F=0(96).

(a) Show that

(3.9)

P*(A)= inf[ P(B): ACB, BE$]

and (see (3.2))

(3.10)

P. ( A) = sup[P(C): CCA, CE ],