English
The Lax-Milgram construction provides a continuous linear equivalence between the space and itself induced by a coercive bilinear form.
Русский
Построение Лакс–Мильграма задаёт непрерывное линейное эквивалентство на пространстве, соответствующее коэрцитивной билинейной форме.
LaTeX
$$$ \text{continuousLinearEquivOfBilin}(B) : V \simeq V. $$$
Lean4
theorem isClosed_range (coercive : IsCoercive B) : IsClosed (range B♯ : Set V) :=
by
rcases coercive.antilipschitz with ⟨_, _, antilipschitz⟩
exact antilipschitz.isClosed_range B♯.uniformContinuous