cross-ratio

短语

[经] 交比, 非调和比

词形变化

cross-ratios 复数 cross-ratios

别名

crossratio

释义与例句

n.
  1. 1.

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

    数学

词源

From cross- + ratio.

来源：wiktionary