Typo fix.

src/fa/lc/inductive.tex

@@ -174,7 +174,7 @@
     \end{itemize}
     In which case, since $U_{k} \supset U_{k+1}$ for all $k \in \natp$,
     \[
-    \underbracs{y - \sum_{k = 1}^n \lambda_kx_k}_{\in E_n} = \underbrace{z + \sum_{k = n + 1}^N \lambda_kx_k}_{\in F_n + U_n}
+    \underbrace{y - \sum_{k = 1}^n \lambda_kx_k}_{\in E_n} = \underbrace{z + \sum_{k = n + 1}^N \lambda_kx_k}_{\in F_n + U_n}
     \]
 
     which is impossible. Therefore $(F_n + U) \cap E_n = \emptyset$ for all $n \in \natp$.