レポート https://akasakas.cool/wp-content/uploads/2020/05/第11回2.1.3-Geometry20190503勉強会-.pdf
音声 https://anchor.fm/tecum/episodes/11A-History-of-Abstract-Algebra-by-I-Kleiner-p20-21-edkiil
2 History of Group Theory
2.1.3 Geometry
１９世紀の数学の大発見と言えるのが、collineation共線性の発見である。３点が同一直線上にあるという条件で、点A,B,Cがある時、ベクトルAB、ベクトルACに対して、片方はもう片方の実数倍で表される。３本の直線が１点を共有するとき共点という。３点が同一直線上にあることとき共線という。共点と共線は双対（そうつい）といって、射影幾何では同じこと。
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