UpdateHEADmaster

1 files changed, 2 insertions, 2 deletions

diff --git a/pages/measure-and-integration/measure-theory/measures.md b/pages/measure-and-integration/measure-theory/measures.md
index c843881..5ad3308 100644
--- a/pages/measure-and-integration/measure-theory/measures.md
+++ b/pages/measure-and-integration/measure-theory/measures.md
@@ -7,7 +7,7 @@ nav_order: 4
 
 # {{ page.title }}
 
-{% definition %}
+{% definition Measure %}
 A *measure* on a σ-algebra $\mathcal{A}$ on a set $X$
 is mapping $\mu : \mathcal{A} \to [0,\infty]$ such that
 
@@ -17,7 +17,7 @@ is mapping $\mu : \mathcal{A} \to [0,\infty]$ such that
 
   $$
   \mu \bigg\lparen \bigcup_{n=1}^{\infty} A_n \! \bigg\rparen
-  = \sum_{n=0}^{\infty} \mu(A_n).
+  = \sum_{n=1}^{\infty} \mu(A_n).
   $$
 {% enddefinition %}