cross-ratio

EnglishEdit

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Alternative formsEdit

NounEdit

cross-ratio (plural cross-ratios)

  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.

SynonymsEdit

  • anharmonic ratio
  • double ratio
Last modified on 19 June 2013, at 00:52