Resolution of divisors by weakly admissible blow-ups

Let (Σ0,Δ0,ξ0)(\Sigma_0,\Delta_0,\xi_0) be a coordinated normal crossing scheme over kk, and let Φ0\Phi_0 be any effective divisor of Σ0\Sigma_0. A weakly admissible composition of blowing-ups over (Δ0,ξ0)(\Delta_0,\xi_0) is a morphism σ:ΣΣ0\sigma:\Sigma\rightarrow\Sigma_0 obtained by such a composition, and an extended pull-back is the coordinated normal crossing scheme (Σ,Δˉ,ξˉ)(\Sigma,\bar{\Delta},\bar{\xi}) induced by σ\sigma. Resolution of divisors conjecture. There exist a weakly admissible composition of blowing-ups σ:ΣΣ0\sigma:\Sigma\rightarrow\Sigma_0 over (Δ0,ξ0)(\Delta_0,\xi_0) and an extended pull-back (Σ,Δˉ,ξˉ)(\Sigma,\bar{\Delta},\bar{\xi}) of (Σ0,Δ0,ξ0)(\Sigma_0,\Delta_0,\xi_0) by σ\sigma satisfying

Supp(σ(Φ0+Δ0))Supp(Δˉ).\operatorname{Supp}(\sigma^*(\Phi_0+\Delta_0))\subset \operatorname{Supp}(\bar{\Delta}).

This is a resolution statement asserting that the total transform of the chosen effective divisor together with the original normal-crossing boundary can be supported on the resulting boundary after a controlled sequence of blow-ups. The supplied text does not state whether this assertion is open, proved, or refuted.

Sources & referencesView supporting material

Primary source

Tohsuke Urabe, “New Ideas for Resolution of Singularities in Arbitrary Characteristics”, arXiv:1004.5446 (2010).

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