theorem Th8: :: PRALG_3:8

for I being non empty set
for S being non empty non void ManySortedSign
for A being MSAlgebra-Family of I,S
for o being OperSymbol of S st the_arity_of o = {} holds
const (o,(product A)) in Funcs (I,(union { (Result (o,(A . i9))) where i9 is Element of I : verum } ))