exact And.intro ivs_nodup fun iv hiv => Or.inl <| ivs_lt iv hiv
case refine_2.refl.refine_1
n : Nat
x : Permutation n
k : Nat
hk : k < n
ivs : Array (Inversion x)
ivs_nodup : Array.Nodup ivs
ivs_lt : ∀ (iv : Inversion x), iv ∈ ivs → ↑iv.snd < k
⊢ Array.Nodup ivs ∧ ∀ (iv : Inversion x), iv ∈ ivs → ↑iv.snd < k ∨ ↑iv.snd = k ∧ ↑iv.fst < 0
no goals