diff -r 606f685e3764 -r cb76847c439e text/evmap.tex
--- a/text/evmap.tex	Wed Jul 28 12:15:58 2010 -0700
+++ b/text/evmap.tex	Wed Jul 28 12:16:27 2010 -0700
@@ -434,7 +434,7 @@
 Note that if $a \ge 2r$ then $\Nbd_a(S) \sup B_r(y)$.
 Let $z\in \Nbd_a(S) \setmin B_r(y)$.
 Consider the triangle
-with vertices $z$, $y$ and $s$ with $s\in S$.
+with vertices $z$, $y$ and $s$ with $s\in S$ such that $z \in B_a(s)$.
 The length of the edge $yz$ is greater than $r$ which is greater
 than the length of the edge $ys$.
 It follows that the angle at $z$ is less than $\pi/2$ (less than $\pi/3$, in fact),