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cross ratio
noun
, Geometry.
- a ratio relating four points in the real or complex plane.
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Other Words From
- cross-rati·o adjective
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Word History and Origins
Origin of cross ratio1
First recorded in 1880–85
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Example Sentences
Before we draw conclusions from this result, we must investigate the meaning of a cross-ratio somewhat more fully.
From Project Gutenberg
If we take the points in a different order, the value of the cross-ratio will change.
From Project Gutenberg
It is convenient to let the point at infinity occupy the last place in the symbolic expression for the cross-ratio.
From Project Gutenberg
The cross-ratio of any four points in one equals that of the corresponding points in the other.
From Project Gutenberg
In other words, four lines in a flat pencil are cut by every other line in four points whose cross-ratio is constant.
From Project Gutenberg
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