[過去ﾛｸﾞ] Inter-universal geometry と ABC予想 (応援スレ) 45 (1002ﾚｽ)
上下前次1-新

---

このｽﾚｯﾄﾞは過去ﾛｸﾞ倉庫に格納されています｡
次ｽﾚ検索 歴削→次ｽﾚ 栞削→次ｽﾚ 過去ﾛｸﾞﾒﾆｭｰ

---

28(1): 現代数学の系譜 雑談 ◆e.a0E5TtKE 2020/05/04(月)16:48 ID:ncpDqOGk(21/40) AAS
>>27 追加

外部ﾘﾝｸ:ja.wikipedia.org
エタール射

エタール射（エタールしゃ、etale morphism）とは、数学において有限型スキーム間の平坦かつ不分岐な射のこと。
目次
1 不分岐
2 平坦
3 同値な定義
4 類体論と不分岐の対応

外部ﾘﾝｸ:en.wikipedia.org
Etale morphism

In algebraic geometry, an etale morphism (French: [etal]) is a morphism of schemes that is formally etale and locally of finite presentation.
This is an algebraic analogue of the notion of a local isomorphism in the complex analytic topology.
They satisfy the hypotheses of the implicit function theorem, but because open sets in the Zariski topology are so large, they are not necessarily local isomorphisms.
Despite this, etale maps retain many of the properties of local analytic isomorphisms, and are useful in defining the algebraic fundamental group and the etale topology.
The word etale is a French adjective, which means "slack", as in "slack tide", or, figuratively, calm, immobile, something left to settle.[1]

Contents
1 Definition
2 Examples
3 Properties
4 Inverse function theorem

---

上下前次1-新書関写板覧索設栞歴

---

あと 974 ﾚｽあります
ｽﾚ情報 赤ﾚｽ抽出 画像ﾚｽ抽出 歴の未読ｽﾚ AAｻﾑﾈｲﾙ

---

ぬこの手 ぬこTOP 0.013s