Category:Harmonic Ratios
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This category contains results about Harmonic Ratios.
Definitions specific to this category can be found in Definitions/Harmonic Ratios.
Let $A$, $B$, $C$ and $D$ be points on a straight line.
Let the cross-ratio $\set {A, B; C, D}$ of $A$, $B$, $C$ and $D$ be equal to $-1$:
- $\dfrac {AC / CB} {AD / DB} = -1$
that is:
- $\dfrac {AC \cdot DB} {AD \cdot CB} = -1$
Then $\set {A, B; C, D}$ is known as a harmonic ratio.
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