cross-ratio
Noun
Meaning
cross-ratio (plural cross-ratios)
(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.
Noun
cross-ratio (plural cross-ratios)
(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.