Limit the range of values taken by $\theta$.

chap6/6.4/6.4.tex

@@ -100,12 +100,12 @@
 will cause a division overflow most of the time.
 
 \newpar{8} Let $n$ be a positive integer and $\theta$ an irrational
-positive real.  We choose a point of origin noted $0$ on a circle
-whose circumference is $1$.  We then move clockwise on the circle and
-place the points whose distance from $0$ is $i\theta$ (we refer to
-this point as $i$), for $i$ varying between $0$ and $n$.  Note that if
-$\alpha$ is irrational then $\lceil \alpha\rceil = 1+\lfloor
-\alpha\rfloor$, thus
+positive real between $0$ and $1$.  We choose a point of origin noted
+$0$ on a circle whose circumference is $1$.  We then move clockwise on
+the circle and place the points whose distance from $0$ is $i\theta$
+(we refer to this point as $i$), for $i$ varying between $0$ and $n$.
+Note that if $\alpha$ is irrational then $\lceil \alpha\rceil =
+1+\lfloor \alpha\rfloor$, thus
 
 \[ \{-\alpha\} = - \alpha - \lfloor -\alpha\rfloor= - \alpha + \lceil \alpha
 \rceil = 1 - \{\alpha\}.\]