The Drinfeld-Grinberg-Kazhdan Theorem for formal schemes and singularity theory
The Drinfeld-Grinberg-Kazhdan Theorem for formal schemes and singularity theory
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形式格式和奇点理论的 Drinfeld-Grinberg-Kazhdan 定理
DOI:
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发表时间:
2017
期刊:
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通讯作者:
J. Sebag
中科院分区:
文献类型:
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作者:
David Bourqui;J. Sebag
Let k be a field. In this article, we provide an extended version of the Drinfeld-Grinberg-Kazhdan Theorem in the context of formal geometry. We prove that, for every formal scheme V topologically of finite type over Spf(k[[T ]]), for every non-singular arc γ ∈ L∞(V )(k), there exists an affine noetherian adic formal k-scheme S and an isomorphism of formal k-schemes L∞(V )γ ∼= S ×k Spf(k[[(Ti)i∈N]]). We emphasize the fact that the proof is constructive and, when V is the completion of an affine algebraic k-variety, effectively implementable. Besides, we derive some properties of such an isomorphism in the direction of singularity theory.