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alan-turing-institute · Nov 9, 2023 · 0485ed1 · 0485ed1
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diff --git a/exercises/axler-1c.md b/exercises/axler-1c.md
@@ -140,7 +140,7 @@ $\mathbf{R}^2$.
 ### Answer
 
 The set
-$$\{(x,0)\in\mathbf{R}^2\mid x\in\mathbf{R}\} \cup \{(0,x)\in\mathbf{R}^2\mid x\in\mathbf{R}\}$$
+$$'\{(x,0)\in\mathbf{R}^2\mid x\in\mathbf{R}\} \cup \{(0,x)\in\mathbf{R}^2\mid x\in\mathbf{R}\}'$$
 is an example. (It is
 “points lying on the axes, but not otherwise.”)