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authorSimon-Kor <52245124+Simon-Kor@users.noreply.github.com>2024-09-16 11:34:01 +0200
committerSimon-Kor <52245124+Simon-Kor@users.noreply.github.com>2024-09-16 11:34:01 +0200
commit588c6ab14184cab4bb7df89def641acaafe3b7eb (patch)
treeda958f5a94676aa7ab557c1ee9b5c4fdc38ecf8a /library/topology/urysohn2.tex
parent640fe16eaab00ea29046ef18e6f751571d923eaa (diff)
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Diffstat (limited to 'library/topology/urysohn2.tex')
-rw-r--r--library/topology/urysohn2.tex14
1 files changed, 7 insertions, 7 deletions
diff --git a/library/topology/urysohn2.tex b/library/topology/urysohn2.tex
index 838b121..83e3aa4 100644
--- a/library/topology/urysohn2.tex
+++ b/library/topology/urysohn2.tex
@@ -367,10 +367,10 @@
\end{subproof}
Let $N = \seq{\zero}{k}$.
Let $M = \pow{X}$.
- Define $V : N \to M$ such that $V(n)=$
+ Define $V : N \to M$ such that $V(n)=
\begin{cases}
- &\at{U}{F(n)} & \text{if} n \in N
- \end{cases}
+ \at{U}{F(n)} & \text{if} n \in N
+ \end{cases}$
$\dom{V} = \seq{\zero}{k}$.
We show that $V$ is a urysohnchain of $X$.
\begin{subproof}
@@ -445,11 +445,11 @@
$B \subseteq X'$ by \cref{powerset_elim,closeds}.
$A \subseteq X'$.
Therefore $A \subseteq A'$.
- Define $U_0: N \to \{A, A'\}$ such that $U_0(n) =$
+ Define $U_0: N \to \{A, A'\}$ such that $U_0(n) =
\begin{cases}
- &A &\text{if} n = \zero \\
- &A' &\text{if} n = 1
- \end{cases}
+ A &\text{if} n = \zero \\
+ A' &\text{if} n = 1
+ \end{cases}$
$U_0$ is a function.
$\dom{U_0} = N$.
$\dom{U_0} \subseteq \naturals$ by \cref{ran_converse}.