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           __   __    ______     ___     ______   
    ___    \ \\/ //  /_   _//   / _ \\  |      \\ 
   /   ||   \ ` //   `-| |,-   / //\ \\ |  --  // 
  | [] ||    | ||      | ||   |  ___  |||  --  \\ 
   \__ ||    |_||      |_||   |_||  |_|||______// 
    -|_||    `-`'      `-`'   `-`   `-` `------`  
     `-`

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Text this: A metric invariant of mobius transformations