ScalingStacks

Lemma 7.5 . [039T]

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Lemma 7.5.

Let RR be a discrete valuation ring which is defined geometrically by a dd-dimensional normal variety BB over the field kk (as in Remark 7.2). Let 𝒳R\mathscr{X}_{R} be a projective integral scheme over RR with nn-dimensional regular generic fiber X′≔𝒳R,ηX^{\prime}\coloneqq\mathscr{X}_{R,\eta}. We assume that resolution of singularities holds over kk in dimension d+nd+n. Then for any ample line bundle L′L^{\prime} on X′X^{\prime}, there exists m∈ℕ>0m\in\mathbb{N}_{>0} and an ample extension ℒR′\mathscr{L}_{R}^{\prime} of (L′)⊗m(L^{\prime})^{\otimes m} to a regular RR-model 𝒳R′\mathscr{X}_{R}^{\prime} of X′X^{\prime} with a projective morphism 𝒳R′→𝒳R\mathscr{X}_{R}^{\prime}\to\mathscr{X}_{R} over RR extending the identity on X′X^{\prime}.

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