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Concept
Cross-ratio
Summary
The cross-ratio is a
projective invariant
of four
collinear points
, meaning it remains unchanged under
projective transformations
. It is a
fundamental concept
in
projective geometry
and is used to describe the
relative ratios
of distances between these points, providing a measure of their
harmonic division
.
Relevant Degrees
Fundamentals of Mathematics 70%
Geometry 30%
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