anchor.diff:                                  var $comment = $('#comment-' + id);
                                   var $area = $comment.find('.comment-body').first();
                                   $area.html(data);
  -                                if ('MathJax' in window) MathJax.Hub.Queue(['Typeset', MathJax.Hub, $area.get(0)]);
  +                                update_math($comment);
                                   var $edits = $comment.find('.comment-edits').first();
                                   $edits.text('updated');
                               }).fail(function () {
  
positive.code:                 }, 500);
              };
  
              window.show_revision = function(comment_id, offset) {
                  var $comment = $("#comment-" + comment_id);
                  var cur_revision = parseInt($comment.attr("data-revision"));
  
negative.code:                     }
  
                      $comment.find('.comment-edit-text').text(' ' + edit_text + ' ');
                      update_math($comment);
                  });
              };
  
  