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Pronunciation varies by accent · noun
(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..
Use cross-ratio when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Cross-ratio means (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..
Common synonyms include anharmonic ratio, double ratio.
The opposite depends on the specific sense.
Use cross-ratio where its definition matches the intended context.
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