[過去ﾛｸﾞ] 現代数学の系譜 工学物理雑談 古典ガロア理論も読む78 (1002ﾚｽ)
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261(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/27(日)12:05 ID:EUeYkluT(1/14) AAS
>>250 追加
類体論の一般化には、下記３つあって
1つは、the Langlands correspondence
1つは、anabelian geometry
1つは、higher class field theory
anabelian geometry が出てくるのが面白。IUTに関連
Langlands programは、
”・・to non-abelian extensions. This generalization is mostly still conjectural. For number fields, class field theory and the results related to the modularity theorem are the only cases known.”
とあるね。the modularity theorem＝谷山?志村予想だね
外部ﾘﾝｸ:en.wikipedia.org
Modularity theorem
外部ﾘﾝｸ:ja.wikipedia.org
谷山?志村予想
外部ﾘﾝｸ:en.wikipedia.org
Class field theory
(抜粋)
In mathematics, class field theory is the branch of algebraic number theory concerned with the abelian extensions of number fields, global fields of positive characteristic, and local fields.
The theory had its origins in the proof of quadratic reciprocity by Gauss at the end of 18th century. These ideas were developed over the next century, giving rise to a set of conjectures by Hilbert that were subsequently proved by Takagi and Artin.
These conjectures and their proofs constitute the main body of class field theory.
つづく
264(1): 現代数学の系譜 雑談 古典ガロア理論も読む ◆e.a0E5TtKE 2019/10/27(日)12:30 ID:EUeYkluT(4/14) AAS
>>261
つづき
Generalizations of class field theory
There are three main generalizations, each of great interest on its own. They are: the Langlands program, anabelian geometry, and higher class field theory.
Often, the Langlands correspondence is viewed as a nonabelian class field theory. If/when fully established, it would contain a certain theory of nonabelian Galois extensions of global fields.
However, the Langlands correspondence does not include as much arithmetical information about finite Galois extensions as class field theory does in the abelian case.
It also does not include an analog of the existence theorem in class field theory, i.e. the concept of class fields is absent in the Langlands correspondence.
There are several other nonabelian theories, local and global, which provide alternative to the Langlands correspondence point of view.
Another generalization of class field theory is anabelian geometry which studies algorithms to restore the original object (e.g. a number field or a hyperbolic curve over it) from the knowledge of its full absolute Galois group of algebraic fundamental group.[3]
Another natural generalization is higher class field theory. It describes abelian extensions of higher local fields and higher global fields.
The latter come as function fields of schemes of finite type over integers and their appropriate localization and completions.
The theory is referred to as higher local class field theory and higher global class field theory. It uses algebraic K-theory and appropriate Milnor K-groups replace K_{1}}K_{1} which is in use in one-dimensional class field theory.
(引用終り)
つづく
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