Furtwängler, P. (English spelling) FurtwanglerP

Japanese: Furtwängler,P.(英語表記)FurtwanglerP
Furtwängler, P. (English spelling) FurtwanglerP

…He made some conjectures about more general cases, especially about an unramified abelian extension K of k whose Galois group is isomorphic to the ideal class group of k , and whose decomposition of a prime ideal of k in K is determined by the ideal class of k to which the prime ideal belongs. He named this the class field of k . These conjectures were proved by P. Furtwängler (1869-1940), but Teiji Takagi extended the definition of ideal class group and class field to construct a theory of general relative abelian extensions that includes these results as special cases, making class field theory more natural and applicable. Furthermore, E. Artin showed that the isomorphism between ideal class groups and Galois groups is given by something called the Artin map. …

*Some of the terminology that mentions "Furtwängler, P." is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…さらに一般的な場合に関するいくつかの予想を述べ,とくにkの不分岐なアーベル拡大Kで,そのガロア群がkのイデアル類群と同型であり,kの素イデアルのKでの分解の形が,その素イデアルが属するkのイデアル類により定まるようなものが存在することを予想し,これをkの類体と名づけた。これらの予想は,フルトベングラーP.Furtwängler(1869‐1940)が証明を与えたが,高木貞治は,イデアル類群や類体の定義を拡張して,これらの結果を特別な場合として含む一般の相対アーベル拡大の理論を構成し,類体論を自然で応用範囲の広いものにした。さらにE.アルティンは,イデアル類群とガロア群との同型がアルティン写像と呼ばれるもので与えられることを示した。…

※「Furtwängler,P.」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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