From: tanglaoya1989@gmail.com   
      
   Dear all,   
      
   I am trying to find a transformation to map non-concentric circles into   
   concentric circles. I have asked questions here:   
   https://math.stackexchange.com/questions/2253898/wrong-mobius-tr   
   nsformation-for-concentric-circles   
      
   Could anyone help me take a look at my problem?   
      
   Thanks,   
   Tang Laoya   
      
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