diff --git a/math/proof/notes.page b/math/proof/notes.page
index ba2597b..908dea4 100644
--- a/math/proof/notes.page
+++ b/math/proof/notes.page
@@ -12,15 +12,15 @@ title: Mathematical Proof Study Notes
 
 ## *Hammack*, 25 Jan 2014
 
-All of Mathematics can be described with sets.
+All of Mathematics can be described with *sets*.
 
 *set*
 : A collection of things. The things in the set are called *elements*.
 
-An example of a set: ${2,4,6,8}$
+An example of a set: $\{2,4,6,8\}$
 
 The set of all integers:
-$$ {\dots, -4, -3, -2, -1, 0, 1, 2, 3, 4, \dots} $$
+$$ \{\dots, -4, -3, -2, -1, 0, 1, 2, 3, 4, \dots\} $$
 
 The dots mean the expressed pattern continues.
 
@@ -29,8 +29,8 @@ Sets of infinitely many members are *infinite*, otherwise they are
 
 Sets are *equal* if they have exactly the same elements.
 
-E.g. ${2,4,5,8} = {4,2,8,6}$ but ${2,4,6,8} \neq {2,4,6,7}$.
+E.g. $\{2,4,5,8\} = \{4,2,8,6\}$ but $\{2,4,6,8\} \neq \{2,4,6,7\}$.
 
-Uppercase letters often denote sets, e.g. $A = {1,2,3,4}$.
+Uppercase letters often denote sets, e.g. $A = \{1,2,3,4\}$.
 
 To express membership, we use $\in$, as in $2 \in A$.