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Sekiguchi-Suwa theory revisited (1104.2222v1)
Published 12 Apr 2011 in math.NT and math.AG
Abstract: We present an account of the construction by S. Sekiguchi and N. Suwa of a cyclic isogeny of affine smooth group schemes unifying the Kummer and Artin-Schreier-Witt isogenies. We complete the construction over an arbitrary base ring. We extend the statements of some results in a form adapted to a further investigation of the models of the group schemes of roots of unity.
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