Section POrderTheory.
Context {disp : unit} {T : porderType disp}.
Implicit Types (x y : T) (s : seq T).
Definition lt_gtF x y hxy := le_gtF (@ltW x y hxy).

Lemma subseq_le_path x s1 s2 : subseq s1 s2 -> path <=%O x s2 -> path <=%O x s1.