code: private static String preLatexmlFixes(String rawTex) {
          Matcher matcher = LTXML_PATTERN.matcher(rawTex);
          if (matcher.find()) {
              rawTex = "{" + rawTex + "}";
          }
          return rawTex;
      }
docs: LaTeXML Bug if there is "\math" command at the beginning of the
  tex expression, it needs to be wrapped in curly brackets.
  
  @param rawTex
  @return