P132 fix

Co-authored-by: Patrick Rabau <70125716+prabau@users.noreply.github.com>

spaces/S000135/properties/P000132.md

@@ -7,8 +7,8 @@ refs:
   name: Counterexamples in Topology
 ---
 
-Since $X\setminus\{(0,0)\}$ is homeomorphic to the disjoint union of continuum many copies of the real line,
-every open set in $X$ missing the origin is $F_\sigma$.
+Since $X\setminus\{(0,0)\}$ is homeomorphic to the disjoint union of copies of the real line
+and {S25|P132}, every open set in $X$ missing the origin is an $F_\sigma$.
 It remains to show that the origin has a basis of open $F_\sigma$ neighborhoods.
 Consider $U=\bigcup\{(-\varepsilon_\theta,\varepsilon_\theta)p_\theta: 0\leq \theta< \pi\}$, with $\varepsilon_\theta>0$
 and $p_\theta=(\cos\theta,\sin\theta)$ for each angle $0\leq \theta < \pi$. Then the set