English
Similarly, the map coweightHom is injective on End P, by duality with weight maps.
Русский
Аналогично, отображение coweightHom инъективно на End P, дуальность с весовыми отображениями обеспечивает это.
LaTeX
$$Injective (coweightHom P)$$
Lean4
theorem weightHom_injective (P : RootPairing ι R M N) : Injective (weightHom P) :=
by
intro f g hfg
ext x
· exact LinearMap.congr_fun hfg x
· refine LinearEquiv.injective P.flip.toPerfPair ?_
simp_rw [← weight_coweight_transpose_apply]
exact congrFun (congrArg DFunLike.coe (congrArg LinearMap.dualMap hfg)) (P.flip.toPerfPair x)
· refine Embedding.injective P.root ?_
simp_rw [← root_weightMap_apply]
exact congrFun (congrArg DFunLike.coe hfg) (P.root x)