Over a ring `S` complete for an ideal `I`, any ring map `O' → S` extends to an evaluation `O'[[T,X]] → S` sending `T ↦ e` and `X ↦ z` for given `e, z ∈ I`.

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Over a ring `S` complete for an ideal `I`, any ring map `O' → S` extends to an evaluation `O'[[T,X]] → S` sending `T ↦ e` and `X ↦ z` for given `e, z ∈ I`. · Prove2Me