theorem :: VFUNCT_1:51

for X, Y being set
for C being non empty set
for V being RealNormSpace
for f2 being PartFunc of C,V
for f1 being PartFunc of C,REAL st f1 | X is V8() & f2 | Y is V8() holds
(f1 (#) f2) | (X /\ Y) is V8()