theorem Th27: :: BVFUNC14:27

for A, B, C, D, E being set
for h being Function
for A9, B9, C9, D9, E9 being set st h = ((((B .--> B9) +* (C .--> C9)) +* (D .--> D9)) +* (E .--> E9)) +* (A .--> A9) holds
dom h = {A,B,C,D,E}