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-rw-r--r--05-types.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/05-types.md b/05-types.md
index a5268bf0e6..3f9ca809f5 100644
--- a/05-types.md
+++ b/05-types.md
@@ -172,7 +172,7 @@ parameters $a_1 , \ldots , a_n$.
Say the type parameters have lower bounds $L_1 , \ldots , L_n$ and
upper bounds $U_1 , \ldots , U_n$. The parameterized type is
well-formed if each actual type parameter
-_conforms to its bounds_, i.e. $σ L_i <: T_i <: σ U_i$ where $σ$ is the
+_conforms to its bounds_, i.e. $\sigma L_i <: T_i <: \sigma U_i$ where $\sigma$ is the
substitution $[ a_1 := T_1 , \ldots , a_n := T_n ]$.
(@param-types) Given the partial type definitions: