User blog comment:Ikosarakt1/Fast-growing hierarchy/@comment-5529393-20130619110333/@comment-5150073-20130619131600

If a = w^2+w and b = w, then a+b = w^2+w+w = w^2+w2, and (w^2+w2)[n] = w^2+w2[n] = w^2+w+n, which is correct.