Update functions.md

jstac · web-flow · commit 57b85e78d76e · 2022-08-16T12:13:17.000+10:00
diff --git a/lectures/functions.md b/lectures/functions.md
@@ -359,7 +359,7 @@ function*---as we did above.
 Recall that $n!$ is read as "$n$ factorial" and defined as
 $n! = n \times (n - 1) \times \cdots \times 2 \times 1$.
 
-We will only consider n as a positive integer here.
+We will only consider $n$ as a positive integer here.
 
 There are functions to compute this in various modules, but let's
 write our own version as an exercise.
@@ -523,4 +523,4 @@ draw_new(3)
 ```
 
 ```{solution-end}
-```
+```
