diff -r 332fbe9c91ab -r ae039d6ae3f2 handouts/notation.tex
--- a/handouts/notation.tex	Mon Oct 06 00:46:18 2014 +0100
+++ b/handouts/notation.tex	Mon Oct 06 20:55:16 2014 +0100
@@ -132,7 +132,7 @@
 \]
 
 \noindent The notation $\in$ means \emph{element of}, so $1
-\in \{1, 2, 3\}$ is true and $3 \in \{1, 2, 3\}$ is false.
+\in \{1, 2, 3\}$ is true and $4 \in \{1, 2, 3\}$ is false.
 Sets can potentially have infinitely many elements. For
 example the set of all natural numbers $\{0, 1, 2, \ldots\}$
 is infinite. This set is often also abbreviated as