English
A linear equivalence arising from a left-inverse yields an isomorphism between the domain and the image.
Русский
Левый обратный линейной эквивалентности задаёт изоморфизм между доменом и образцом.
LaTeX
$$def ofLeftInverse [RingHomInvPair σ₁₂ σ₂₁] {g : M₂ → M} (h : Function.LeftInverse g f) : M ≃_l[σ₁₂] (LinearMap.range f)$$
Lean4
/-- The top submodule of `M` is linearly equivalent to `M`. -/
def ofTop (h : p = ⊤) : p ≃ₗ[R] M :=
{ p.subtype with invFun := fun x => ⟨x, h.symm ▸ trivial⟩ }