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→Definition: ε can be compared to an infinitesimal number |
→Matrix representation: linked to mobius and laguerre transformations |
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: <math>\begin{pmatrix}A + C\epsilon & -B + D\epsilon \\ B + D\epsilon & A - C\epsilon\end{pmatrix}.</math>
The above two matrix representations are related to the [[Möbius transformation|Möbius transformations]] and [[Laguerre transformations]] respectively.
== Terminology ==
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