--- loncom/xml/lontexconvert.pm	2005/02/24 09:06:14	1.50
+++ loncom/xml/lontexconvert.pm	2005/02/24 09:44:46	1.53
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.50 2005/02/24 09:06:14 albertel Exp $
+# $Id: lontexconvert.pm,v 1.53 2005/02/24 09:44:46 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -249,10 +249,23 @@ sub postprocess_algebra {
     my ($string)=@_;
     
     # moodle had these and I don't know why, ignoring them for now
-    # $string =~/\\left\{/\{/g;
-    # $string =~/\\right\}/\}/g;
-    # $string =~/\\fun/ /g;
+    # $string =~s/\\fun/ /g;
 
+    # sqrt(3,4) -> \sqrt\let{3,4\right}, which is annoying
+    $string =~s/\\left\{/\{/g;
+    $string =~s/\\right\}/\}/g;
+    
+    # sqrt(3,4) means the 4 root of 3
+    $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;
+
+    # log(3,4) means the log base 4 of 3
+    $string =~s/\\log\\left\((.+?),(.+?)\\right\)/\\log_{$2}\\left($1\\right)/gs;
+
+    # remove the extra () in the denominator of a \frac
+    $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
+
+    
+    &Apache::lonnet::logthis($string);
     return $string;
 }
 1;