
theorem
for X1,X2 be non empty set, S1 be SigmaField of X1, S2 be SigmaField of X2,
M1 be sigma_Measure of S1, M2 be sigma_Measure of S2,
E be Subset of [:X1,X2:] holds
 (C_Meas product_Measure(M1,M2)).E = inf(Svc(product_Measure(M1,M2),E))
by MEASURE8:def 8;
