End FilterSubseq.
Arguments subseq_uniqP [T s1 s2].
Section EqMap.
Variables (n0 : nat) (T1 : eqType) (x1 : T1).
Variables (T2 : eqType) (x2 : T2) (f : T1 -> T2).
Implicit Type s : seq T1.

Lemma perm_map s t : perm_eq s t -> perm_eq (map f s) (map f t).
End EqMap.