theorem Th110: :: HILB10_7:110

for D being non empty set
for A being BinOp of D
for f being FinSequence of D
for F being finite set
for E being Enumeration of F
for p being Permutation of (dom E)
for s being FinSequence st s in doms ((SignGenOp (f,A,F)) * E) holds
s * p in doms ((SignGenOp (f,A,F)) * (E * p))