--- loncom/xml/londefdef.pm	2005/02/10 23:00:09	1.256
+++ loncom/xml/londefdef.pm	2005/02/18 23:22:43	1.257
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Tags Default Definition Module 
 #
-# $Id: londefdef.pm,v 1.256 2005/02/10 23:00:09 albertel Exp $
+# $Id: londefdef.pm,v 1.257 2005/02/18 23:22:43 albertel Exp $
 # 
 #
 # Copyright Michigan State University Board of Trustees
@@ -106,6 +106,13 @@ sub start_m {
 	    $currentstring=&Apache::run::evaluate($currentstring,$safeeval,$$parstack[-1]);
 	}
 	if ($currentstring=~/^(\s*\\\\\s*)*$/) {$currentstring = ' \vskip 0 mm ';}
+	# detect simple math mode entry exits, and convert them
+        # to use \ensuremath
+	if ($currentstring=~/^\s*\$[^\$].*[^\$]\$\s*$/) {
+	    $currentstring=~s/^\$//;
+	    $currentstring=~s/\$$//;
+	    $currentstring='\ensuremath{'.$currentstring.'}';
+	}
 	$Apache::lonxml::post_evaluate=0;
     }
     return $currentstring;