theorem :: JORDAN1G:15

for f being non trivial special unfolded standard FinSequence of (TOP-REAL 2) st ( ( f /. 1 <> E-min (L~ f) & f /. (len f) <> E-min (L~ f) ) or ( f /. 1 <> E-max (L~ f) & f /. (len f) <> E-max (L~ f) ) ) holds
E-min (L~ f) <> E-max (L~ f)