...In particular, it was discovered that homology groups are invariant even under homotopy equivalences, which are broader than homeomorphisms and are not necessarily one-to-one mappings, and research on homotopy became active. Homotopy groups, which are a generalization of fundamental groups, were introduced by W. Hurewicz (1904-56) in 1935, and using this as a tool, research on homotopy progressed, and the results contributed to the solution of many problems in mathematics. *Some of the terminology that mentions "Hurewicz, W." is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…とくに,ホモロジー群は同相写像よりもっと広いホモトピー同値と呼ばれる必ずしも1対1対応ではない写像によっても不変であることがわかり,ホモトピーについての研究が活発となった。基本群を一般化したホモトピー群がフレビッチW.Hurewicz(1904‐56)によって導入され(1935),これを武器にホモトピーについての研究が進められ,その成果は数学におけるいろいろな問題の解決に寄与した。 ※「Hurewicz,W.」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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