:: deftheorem Def12 defines n_n_e JORDAN5D:def 12 :
for g being non constant standard special_circular_sequence
for b₂ being Nat holds
( b₂ = n_n_e g iff ( 1 <= b₂ & b₂ + 1 <= len g & g . b₂ = E-max (L~ g) ) );