crossratio
See also: crossratio
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EnglishEdit
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EtymologyEdit
NounEdit
crossratio (plural crossratios)
 (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
TranslationsEdit
a special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations
