Dear forum;

 

I am trying to write some code to  find Z(chi);

 

where   Z(\chi ) = \{ g \in G\left| {\left| {\chi (g)} \right| = \chi (1)\} } 
\right

 

 

it seems that GAP doesn't contain function to find the magnitude for  complex 
number?

 

is there any way to calculate the above expression?

 

thanks.

 

 

saad

 

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