Lemma 10, p. 7 — 0 → J → Λ → Λ/J → 0 splits iff some φ has φ ≡ 1 mod J and φJ = Jφ = 0; φ is then a unique central idempotent

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Lemma 10, p. 7 — 0 → J → Λ → Λ/J → 0 splits iff some φ has φ ≡ 1 mod J and φJ = Jφ = 0; φ is then a unique central idempotent · Prove2Me