Fixed string variable declaration
diff --git a/src/commands/math/commands.js b/src/commands/math/commands.js
index 2b9baf8..51e712a 100644
--- a/src/commands/math/commands.js
+++ b/src/commands/math/commands.js
@@ -814,7 +814,7 @@
     return this;
   };
   _.parser = function() {
-    var self = this;
+    var self = this,
       string = Parser.string, regex = Parser.regex, succeed = Parser.succeed;
     return string('{').then(regex(/^[a-z][a-z0-9]*/i)).skip(string('}'))
       .then(function(name) {