Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geometry A special
number associated with anordered quadruple ofcollinear points , particularly points on aprojective line , andpreserved by thefractional linear transformations .
Etymologies
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Examples
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P2 meets κ, the said cross-ratio may be regarded as a function of the point pair.
Nineteenth Century Geometry Torretti, Roberto 2007
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