theorem Th52: :: CFUNCT_1:53

for X being set
for C being non empty set
for f1, f2 being PartFunc of C,COMPLEX holds
( (f1 (#) f2) | X = (f1 | X) (#) (f2 | X) & (f1 (#) f2) | X = (f1 | X) (#) f2 & (f1 (#) f2) | X = f1 (#) (f2 | X) )