Jisho

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四元群
Wikipedia definition
1. Klein four-groupIn mathematics, the Klein four-group (or just Klein group or Vierergruppe, often symbolized by the letter V) is the group Z2 × Z2, the direct product of two copies of the cyclic group of order 2. It was named Vierergruppe by Felix Klein in his Vorlesungen über das Ikosaeder und die Auflösung der Gleichungen vom fünften Grade in 1884. The Klein four-group is the smallest non-cyclic group.
Read “Klein four-group” on English Wikipedia
Read “クラインの四元群” on Japanese Wikipedia
Read “Klein four-group” on DBpedia

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