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- W2937613960 abstract "In characteristic two and dimension two, wild Z/2Z-actions on k[[u,v]] ramified precisely at the origin were classified by Artin, who showed in particular that they induce hypersurface singularities. We introduce in this article a new class of wild quotient singularities in any characteristic p>0 arising from certain non-linear actions of Z/pZ on the formal power series ring in n variables. These actions are ramified precisely at the origin, and their rings of invariants in dimension n=2 are hypersurface singularities, with an equation of a form similar to the form found by Artin when p=2. In higher dimension, the rings of invariants are not local complete intersection in general, but remain quasi-Gorenstein. We establish several structure results for such actions and their corresponding rings of invariants." @default.
- W2937613960 created "2019-04-25" @default.
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- W2937613960 date "2019-04-17" @default.
- W2937613960 modified "2023-09-23" @default.
- W2937613960 title "Moderately ramified actions in positive characteristic" @default.
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