`BookProof.ChapterWeylSl2.Sl2Rep.codim_one` : ∀ (n : ℕ) {V : Type u} [AddCommGroup V] [Module ℂ V] [FiniteDimensional ℂ V] (R : Sl2Rep V) (phi : V →ₗ[ℂ] ℂ) (v0 : V), phi v0 = 1 → (

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`BookProof.ChapterWeylSl2.Sl2Rep.codim_one` : ∀ (n : ℕ) {V : Type u} [AddCommGroup V] [Module ℂ V] [FiniteDimensional ℂ V] (R : Sl2Rep V) (phi : V →ₗ[ℂ] ℂ) (v0 : V), phi v0 = 1 → ( · Prove2Me