public static boolean isAmbiguous(String str){
  return null != ambiguousHashTable.get(str);
}

public static boolean isAmbiguous ( String str ) { return null != ambiguousHashTable . get ( str ) ; }
a hashtable of all built - in symbols that can appear as ordinary punctuation . the entry for a symbol is the tex string that produces it . ( that string need work only outside math mode . )
