English
The orthogonal of a closure equals the orthogonal of the subspace: (closure K)^⊥ = K^⊥.
Русский
Ортогональное дополнение замыкания подпространства равно ортогональному дополнению самого подпространства.
LaTeX
$$$\overline{K}^{\perp} = K^{\perp}$$$
Lean4
/-- The closure of a submodule has the same orthogonal complement and the submodule itself. -/
@[simp]
theorem orthogonal_closure (K : Submodule 𝕜 E) : K.topologicalClosureᗮ = Kᗮ :=
le_antisymm (orthogonal_le <| le_topologicalClosure _) fun x hx y hy ↦
closure_minimal hx (isClosed_eq (by fun_prop) (by fun_prop)) hy