theorem Th50: :: BVFUNC14:50

for A, B, C, D, E, F, J being set
for h being Function
for A9, B9, C9, D9, E9, F9, J9 being set st h = ((((((B .--> B9) +* (C .--> C9)) +* (D .--> D9)) +* (E .--> E9)) +* (F .--> F9)) +* (J .--> J9)) +* (A .--> A9) holds
dom h = {A,B,C,D,E,F,J}