Put \ifx guards on most other package includes, too.

[mjotex.git] / mjo-algebra.tex

diff --git a/mjo-algebra.tex b/mjo-algebra.tex
index 88523456235e4bde91b99d9f99f1fcd41280588c..0b8dc93c2df8ad9da5f2b911c61eb251bc8f6b43 100644 (file)
--- a/mjo-algebra.tex
+++ b/mjo-algebra.tex
@@ -5,8 +5,9 @@
 \def\havemjoalgebra{1}
 
 
-% Needed for \operatorname.
-\usepackage{amsopn}
+\ifx\operatorname\undefined
+  \usepackage{amsopn}
+\fi
 
 % The fraction field of its argument, an integral domain. The name
 % "Frac" was chosen here instead of "Quot" because the latter