Yasuda's local smoothness conjecture for higher Nash blowups

Let RR be a local complete Noetherian domain with coefficient field kk, and set X:=SpecRX:=\operatorname{Spec}R. For every nN0n\in\mathbb{N}_0, consider the nn-th Nash blowup Nashn(X)\mathbf{Nash}_n(X), which is asserted to be well-defined even when XX is not algebraizable. Let JXJ_X be the Jacobian subscheme and JX(d1)J_X^{(d-1)} its (d1)(d-1)-th neighborhood. Yasuda's local conjecture. If [Z]Nashn(X)[Z]\in\mathbf{Nash}_n(X) satisfies ZJX(d1)Z\nsubseteq J_X^{(d-1)}, then Nashn(X)\mathbf{Nash}_n(X) is regular at [Z][Z]. The statement is presented as a reduction of Yasuda's global conjecture to the local complete domain case, and also includes the well-definedness assertion for higher Nash blowups of non-algebraizable formal schemes.

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Primary source

Takehiko Yasuda, “Higher Nash blowups”, arXiv:math/0512184 (2006).

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