--- loncom/homework/response.pm	2007/08/10 21:27:56	1.175
+++ loncom/homework/response.pm	2007/08/10 22:04:10	1.176
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # various response type definitons response definition
 #
-# $Id: response.pm,v 1.175 2007/08/10 21:27:56 albertel Exp $
+# $Id: response.pm,v 1.176 2007/08/10 22:04:10 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -569,7 +569,7 @@ sub implicit_multiplication {
     $expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi;
 # Fill in multiplication signs
 # a b -> a*b;3 b -> 3*b;3 4 -> 3*4
-    $expr=~s/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/gs;
+    $expression=~s/([A-Za-z0-9])\s+(?=[A-Za-z0-9])/$1\*/gs;
 # )( -> )*(; ) ( -> )*(
     $expression=~s/\)\s*\(/\)\*\(/gs;
 # 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A