--- loncom/interface/entities.pm	2009/07/01 11:15:08	1.18.6.1
+++ loncom/interface/entities.pm	2014/08/25 18:02:48	1.21
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # entity -> tex.
 #
-# $Id: entities.pm,v 1.18.6.1 2009/07/01 11:15:08 foxr Exp $
+# $Id: entities.pm,v 1.21 2014/08/25 18:02:48 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -657,6 +657,7 @@ my %entities = (
     'uarr'   => '\ensuremath{\uparrow}',
     8594     => '\ensuremath{\rightarrow}',
     'rarr'   => '\ensuremath{\rightarrow}',
+    'rightarrow' => '\ensuremath{\rightarrow}',
     8595     => '\ensuremath{\downarrow}',
     'darr'   => '\ensuremath{\downarrow}',
     8596     => '\ensuremath{\leftrightarrow}',
@@ -788,7 +789,10 @@ my %entities = (
     'cong'   => '\ensuremath{\cong}',
     8773     => '\ensuremath{\cong}',
     8775     => '\ensuremath{\ncong}',
+    8776     => '\ensuremath{\approx}',
+    'approx' => '\ensuremath{\approx}', 
     8778     => '\ensuremath{\approxeq}',
+    'approxeq' => '\ensuremath{\approxeq}',
     8784     => '\ensuremath{\doteq}',
     8785     => '\ensuremath{\doteqdot}',
     8786     => '\ensuremath{\fallingdotseq}',