theorem :: FUNCT_6:16

for X, Y, Z, V1, V2 being set
for f being Function st ( curry f in PFuncs (X,(PFuncs (Y,Z))) or curry' f in PFuncs (Y,(PFuncs (X,Z))) ) & dom f c= [:V1,V2:] holds
f in PFuncs ([:X,Y:],Z)