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       Another example      
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        Everett Howe  
        
         
            
         05-20-2010 23:45 
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        This number of points is also reached by the hyperelliptic curve y^2 = x^7 - x, which is the reduction of the Klein quartic in characteristic 7.  Its automorphism group is the direct product of PGL(2,F_7) with the group of order 2 containing the hyperelliptic involution, so the automorphism group has order 672.
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