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