English
The two-element family {K, K^⊥} forms an orthogonal family: any vector from K is orthogonal to any vector from K^⊥.
Русский
Пара подпространств {K, K^⊥} образует ортогональную семью: любые векторы из K и из K^⊥ взаимно ортогональны.
LaTeX
$$$\forall x \in K, \forall y \in K^{\perp}, \langle x, y \rangle = 0$$$
Lean4
theorem orthogonalFamily_self : OrthogonalFamily 𝕜 (fun b => ↥(cond b K Kᗮ)) fun b => (cond b K Kᗮ).subtypeₗᵢ
| true, true => absurd rfl
| true, false => fun _ x y => inner_right_of_mem_orthogonal x.prop y.prop
| false, true => fun _ x y => inner_left_of_mem_orthogonal y.prop x.prop
| false, false => absurd rfl