--- loncom/homework/math_parser/Tokenizer.pm	2015/06/29 15:42:13	1.1
+++ loncom/homework/math_parser/Tokenizer.pm	2015/08/13 18:30:30	1.2
@@ -182,7 +182,7 @@ main:
         
         # names
         if (($c ge 'a' && $c le 'z') || ($c ge 'A' && $c le 'Z') ||
-                ($c ge 'α' && $c le 'ω') || ($c ge 'Α' && $c le 'Ω') || $c eq 'µ') {
+                ($c ge 'α' && $c le 'ω') || ($c ge 'Α' && $c le 'Ω') || $c eq 'µ' || $c eq '°') {
             $value = $c;
             $i++;
             for (;;) {