English Dictionary

cross-ratio

名詞

(geometry) A special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations.

日本語の意味

射影幾何学において、共線な4点（特に射影直線上の4点）に関連付けられる不変の数値（交比）

The cross-ratio of four collinear points remains invariant under any fractional linear transformation.

4つの同一直線上の点に対応する不変数（クロス比）は、任意の分数線形変換によって不変である。

意味（1）

(geometry) A special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations.

cross-ratios （ plural ）