Embedded resolution with an snc boundary

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Let Xˉ\bar{X} be a smooth scheme over a perfect field kk, let D⊂XˉD\subset\bar{X} be an snc divisor, and let Zˉ⊂Xˉ\bar{Z}\subset\bar{X} be a reduced closed subscheme that is smooth over Xˉ∖D\bar{X}\setminus D, with Zˉ∖D\bar{Z}\setminus D smooth over kk.

Embedded resolution with boundary. The triple (Xˉ,D,Zˉ)(\bar{X},D,\bar{Z}) admits a resolution by blowups in smooth centers

Yˉ:=Xˉm→Xˉm−1→⋯→Xˉ2→Xˉ1:=Xˉ,\bar{Y}:=\bar{X}_m\to\bar{X}_{m-1}\to\dots\to\bar{X}_2\to\bar{X}_1:=\bar{X},

such that each Xˉi+1→πiXˉi\bar{X}_{i+1}\xrightarrow{\pi_i}\bar{X}_i is a blowup in a smooth center WiW_i with exceptional divisor Ei+1E_{i+1}; with D1:=DD_1:=D and Di+1D_{i+1} the strict transform of DiD_i in Xˉi+1\bar{X}_{i+1}, each DiD_i is an snc divisor and Wi⊂DiW_i\subset D_i; and π−1(Zˉ)\pi^{-1}(\bar{Z}) is a smooth kk-scheme.

This stronger boundary-compatible resolution conjecture implies embedded resolution over a perfect field. The source does not state a general resolution result for it; only the related lower-dimensional embedded-resolution results are given.

References

Primary source

Amine Koubaa, “Purity in the tame cohomology”, arXiv:2408.02542 (2026).

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