Conditions for Fin.insertNth to be monotone or strictly monotone #
theorem Fin.strictMono_insertNth_zero {n : ℕ} {α : Type u_1} [Preorder α] {f : Fin (n + 1) → α} (hf : StrictMono f) (x : α) (hx : x < f 0) :
StrictMono (insertNth 0 x f)
theorem Fin.strictMono_insertNth_last {n : ℕ} {α : Type u_1} [Preorder α] {f : Fin (n + 1) → α} (hf : StrictMono f) (x : α) (hx : f (last n) < x) :
StrictMono ((last (n + 1)).insertNth x f)