theorem :: MESFUN17:56

for I, J, K being non empty closed_interval Subset of REAL
for g being PartFunc of [:[:REAL,REAL:],REAL:],REAL st [:[:I,J:],K:] = dom g holds
Integral (L-Meas,((Integral1 ((Prod_Measure (L-Meas,L-Meas)),(R_EAL g))) | (REAL \ K))) = 0