Hasse Unit Indices of Dihedral Octic CM–Fields

  title={Hasse Unit Indices of Dihedral Octic CM–Fields},
  author={St{\'e}phane Louboutin},
We develop a technique for computing Hasse unit indices of dihedral octic CM–fields. This technique stems from a simple result which enables us to test whether a totally positive element of a real biquadratic bicylic number field K is a square in K. 


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