LateX-2e moans about using \\choose

--- a/doc-src/TutorialI/Sets/sets.tex	Fri Jan 12 17:59:37 2001 +0100
+++ b/doc-src/TutorialI/Sets/sets.tex	Fri Jan 12 18:00:12 2001 +0100
@@ -402,7 +402,7 @@
 \rulename{n_subsets}
 \end{isabelle}
 Writing $|A|$ as $n$, the last of these theorems says that the number of
-$k$-element subsets of~$A$ is $n \choose k$.
+$k$-element subsets of~$A$ is $\binom{n}{k}$.
 
 \begin{warn}
 The term \isa{Finite\ A} is an abbreviation for