is a Salem number of degree d = 2s, then it has two real conjugates,
and 
, and s-1 pairs of complex conjugates
for 
. All the numbers 
lie in the set 
. As is familiar from the geometry of numbers
[2], p.96, we can think of 
as a lattice 
in 
defined by mapping 
onto the point 
,
where 
denotes the conjugate of 
corresponding to the conjugation
.
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