1 files changed, 1 insertions, 1 deletions

diff --git a/si/n2.lyx b/si/n2.lyx
index 946c8e4..c9f5390 100644
--- a/si/n2.lyx
+++ b/si/n2.lyx
@@ -269,7 +269,7 @@ Y-O
 \end_inset
 
 , sea 
-\begin_inset Formula $N:=\{S\subseteq V\mid (u,S)\in A\}$
+\begin_inset Formula $N\coloneqq \{S\subseteq V\mid (u,S)\in A\}$
 \end_inset
 
 ,