Lemma 71.12.4. With hypotheses and notation as in Lemma 71.12.1 above. Assume \mathcal{A}_ d \to \mathcal{B}_ d is an isomorphism for all d \gg 0. Then
U(\psi ) = Q,
r_\psi : Q \to P is an isomorphism, and
the maps \theta : r_\psi ^*\mathcal{O}_ P(n) \to \mathcal{O}_ Q(n) are isomorphisms.
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