theorem Th20: :: AOFA_A00:20

for a1, a2, a3, a4, a5, a6 being object
for f being FinSequence holds
( f = <*a1,a2,a3,a4,a5,a6*> iff ( len f = 6 & f . 1 = a1 & f . 2 = a2 & f . 3 = a3 & f . 4 = a4 & f . 5 = a5 & f . 6 = a6 ) )