crossratio
See also: crossratio
English[edit]
Alternative forms[edit]
Noun[edit]
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.
Synonyms[edit]
Translations[edit]
a special number associated with an ordered quadruple of collinear points, particularly points on a projective line, and preserved by the fractional linear transformations
