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Jan 31, 2014 at 19:33 history edited Sasha Anan'in CC BY-SA 3.0
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Jan 31, 2014 at 6:29 history edited Sasha Anan'in CC BY-SA 3.0
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Jan 30, 2014 at 22:03 vote accept MvG
Jan 30, 2014 at 22:03 comment added MvG Thanks a lot! I now see how I can represent my circles as $$h=\begin{pmatrix}x^2+y^2-r^2&x+iy\\x-iy&1\end{pmatrix}$$ and operate on them by $ghg^*$ as you described. If I had to, I could turn this into a $4\times4$ matrix on the original description, but for the moment I'm very happy with this representation.
Jan 30, 2014 at 18:22 history answered Sasha Anan'in CC BY-SA 3.0