some small changes

inputs/lecture_14.tex

@@ -85,9 +85,8 @@
     \[
     \forall  x \in X.~(\exists n.~(x,n) \in R \iff \exists! n.~(x,n)\in R^\ast).
     \]
-    We say that $R^\ast$ \vocab[uniformization]{uniformizes} $R$.
-    \todo{missing picture
-        \url{https://upload.wikimedia.org/wikipedia/commons/4/4c/Uniformization_ill.png}}
+    We say that $R^\ast$ \vocab[uniformization]{uniformizes} $R$.%
+    \footnote{Wikimedia has a \href{https://upload.wikimedia.org/wikipedia/commons/4/4c/Uniformization_ill.png}{nice picture.}}
 
 \end{theorem}
 \begin{proof}