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-rw-r--r--library/topology/urysohn2.tex4
1 files changed, 3 insertions, 1 deletions
diff --git a/library/topology/urysohn2.tex b/library/topology/urysohn2.tex
index 05ea180..f2f6ef3 100644
--- a/library/topology/urysohn2.tex
+++ b/library/topology/urysohn2.tex
@@ -46,7 +46,9 @@
Define $f : X \to \reals$ such that $f(x) = $
\begin{cases}
- &(x + x) , x \in X
+ &(x + x) &\text{if} x \in X
+ & x &\text{if} x \neq \zero
+ & \zero & \text{if} x = \zero
% & x ,x \in X <- will result in technicly ambigus parse
\end{cases}