Mobius Geometry identity












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How do you prove that all figures consisting of three distinct points are congruent in Mobius Geometry?



I understand it relates to the Fundamental Theorem of Mobius Geometry. The concepts of which are very hard for me to grasp.










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  • $begingroup$
    For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
    $endgroup$
    – Jean Marie
    Jan 31 at 21:55
















2












$begingroup$


How do you prove that all figures consisting of three distinct points are congruent in Mobius Geometry?



I understand it relates to the Fundamental Theorem of Mobius Geometry. The concepts of which are very hard for me to grasp.










share|cite|improve this question











$endgroup$












  • $begingroup$
    For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
    $endgroup$
    – Jean Marie
    Jan 31 at 21:55














2












2








2





$begingroup$


How do you prove that all figures consisting of three distinct points are congruent in Mobius Geometry?



I understand it relates to the Fundamental Theorem of Mobius Geometry. The concepts of which are very hard for me to grasp.










share|cite|improve this question











$endgroup$




How do you prove that all figures consisting of three distinct points are congruent in Mobius Geometry?



I understand it relates to the Fundamental Theorem of Mobius Geometry. The concepts of which are very hard for me to grasp.







geometry mobius-transformation






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edited Jan 31 at 6:52









YuiTo Cheng

2,2634937




2,2634937










asked Jan 31 at 3:10









Melissa JohnsonMelissa Johnson

134




134












  • $begingroup$
    For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
    $endgroup$
    – Jean Marie
    Jan 31 at 21:55


















  • $begingroup$
    For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
    $endgroup$
    – Jean Marie
    Jan 31 at 21:55
















$begingroup$
For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
$endgroup$
– Jean Marie
Jan 31 at 21:55




$begingroup$
For a (rather understandible) application to quantum computing, take a look to "symmetric entanglement classes for n qubits " by Martin Aulbach that you will find on ResearchGate
$endgroup$
– Jean Marie
Jan 31 at 21:55










1 Answer
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$begingroup$

I suppose there are many ways of looking at this, but here’s how I think of it: take your three distinct complex numbers, ${a,b,c}$. Then you can get a Möbius transformation mapping these to ${0,1,infty}$, namely
$$
zmapsto f(z)=frac{z-a}{z-c},,
$$

except of course that this sent $b$ to $lambda=frac{b-a}{b-c}$ instead of to $1$. Well: just change that $f$ to $frac1lambda f$. You still have $amapsto0$, $cmapstoinfty$, and now, besides, $bmapsto1$.






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    $begingroup$

    I suppose there are many ways of looking at this, but here’s how I think of it: take your three distinct complex numbers, ${a,b,c}$. Then you can get a Möbius transformation mapping these to ${0,1,infty}$, namely
    $$
    zmapsto f(z)=frac{z-a}{z-c},,
    $$

    except of course that this sent $b$ to $lambda=frac{b-a}{b-c}$ instead of to $1$. Well: just change that $f$ to $frac1lambda f$. You still have $amapsto0$, $cmapstoinfty$, and now, besides, $bmapsto1$.






    share|cite|improve this answer









    $endgroup$


















      2












      $begingroup$

      I suppose there are many ways of looking at this, but here’s how I think of it: take your three distinct complex numbers, ${a,b,c}$. Then you can get a Möbius transformation mapping these to ${0,1,infty}$, namely
      $$
      zmapsto f(z)=frac{z-a}{z-c},,
      $$

      except of course that this sent $b$ to $lambda=frac{b-a}{b-c}$ instead of to $1$. Well: just change that $f$ to $frac1lambda f$. You still have $amapsto0$, $cmapstoinfty$, and now, besides, $bmapsto1$.






      share|cite|improve this answer









      $endgroup$
















        2












        2








        2





        $begingroup$

        I suppose there are many ways of looking at this, but here’s how I think of it: take your three distinct complex numbers, ${a,b,c}$. Then you can get a Möbius transformation mapping these to ${0,1,infty}$, namely
        $$
        zmapsto f(z)=frac{z-a}{z-c},,
        $$

        except of course that this sent $b$ to $lambda=frac{b-a}{b-c}$ instead of to $1$. Well: just change that $f$ to $frac1lambda f$. You still have $amapsto0$, $cmapstoinfty$, and now, besides, $bmapsto1$.






        share|cite|improve this answer









        $endgroup$



        I suppose there are many ways of looking at this, but here’s how I think of it: take your three distinct complex numbers, ${a,b,c}$. Then you can get a Möbius transformation mapping these to ${0,1,infty}$, namely
        $$
        zmapsto f(z)=frac{z-a}{z-c},,
        $$

        except of course that this sent $b$ to $lambda=frac{b-a}{b-c}$ instead of to $1$. Well: just change that $f$ to $frac1lambda f$. You still have $amapsto0$, $cmapstoinfty$, and now, besides, $bmapsto1$.







        share|cite|improve this answer












        share|cite|improve this answer



        share|cite|improve this answer










        answered Jan 31 at 3:34









        LubinLubin

        45.5k44688




        45.5k44688






























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