Staudt, KGCvon (English spelling) StaudtKGCvon

Japanese: Staudt,K.G.C.von(英語表記)StaudtKGCvon
Staudt, KGCvon (English spelling) StaudtKGCvon

...Its foundations were established by J. V. Poncelet, who discovered that anharmonic ratios are projective properties and that duality in projective geometry is also found in them. Following this, J. Steiner (1796-1863) showed that quadratic curves and surfaces can also be treated projectively, AF Möbius and J. Plücker introduced coordinates and established projective geometry as analytic geometry, and K. G. von Staudt (1798-1867) established it as synthetic geometry based on Desargues' theorem.
[Non-Euclidean Geometry]
Of the five postulates given by Euclid, the fifth states that "if one line intersects two lines and the sum of the angles on the same side is less than two right angles, then the two lines, when extended infinitely, will intersect on that side."

*Some of the terminology references "Staudt, KGCvon" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…その基礎は,非調和比が射影的性質であることや,射影幾何学の双対性を見いだしたJ.V.ポンスレによって築かれた。これを継承して,シュタイナーJ.Steiner(1796‐1863)は二次曲線や二次曲面も射影的に扱えることを示し,A.F.メービウスやJ.プリュッカーは座標を導入して射影幾何学を解析幾何学として建設し,またシュタウトK.G.C.von Staudt(1798‐1867)はデザルグの定理を基としてそれを総合幾何学として建設した。
[非ユークリッド幾何学]
 ユークリッドがあげた5個の公準のうち,第5番目のものは〈1直線が2直線と交わり,同じ側の内角の和が2直角より小ならば,2直線は限りなく延長するとその側で交わる〉と述べられている。…

※「Staudt,K.G.C.von」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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