theorem Th15: :: POLYNOM3:15

for L being non empty multMagma
for p, q, r being sequence of L
for t being FinSequence of 3 -tuples_on NAT
for P being Permutation of (dom t)
for t1 being FinSequence of 3 -tuples_on NAT st t1 = t * P holds
prodTuples (p,q,r,t1) = (prodTuples (p,q,r,t)) * P