English
The map from LieSubalgebra to Submodule is injective.
Русский
Отображение подалгебры в подподмножество инъективно.
LaTeX
$$$$\forall {R} {L} [\text{CommRing } R] [\text{LieRing } L] [\text{LieAlgebra } R L],\ \text{Function.Injective} (\uparrow) : \text{LieSubalgebra } R L \to \text{Submodule } R L.$$$$
Lean4
/-- An `L`-equivariant map of Lie modules `M → N` is `L'`-equivariant for any Lie subalgebra
`L' ⊆ L`. -/
def _root_.LieModuleHom.restrictLie (f : M →ₗ⁅R,L⁆ N) (L' : LieSubalgebra R L) : M →ₗ⁅R,L'⁆ N :=
{ (f : M →ₗ[R] N) with map_lie' := @fun x m ↦ f.map_lie (↑x) m }