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Definition: sequence of length n over S
s is a sequence of length n over S : <=> s: Nn -> S.
Definition: length of a sequence
length(s) :=
such n in N: exists S: s is a sequence of length n over S.
Definition: finite sequence
s is a finite sequence over S : <=>
exists n in N: s is a sequence of length n over S.
Definition: infinite sequence
s is an infinite sequence over S : <=> s: N -> S.