@WeiZhong: Whoa! Your search engine really works! It's true that the list of results is a mixed bag, but among some irrelevant ones I have also found some more relevant than the ones suggested by other users above. What I like is that even though one of the search terms is $a^{bc} = (a^b)^c$, the search engine also found a question containing $(z^a)^b \ne z^{ab}$ (notice that the relation is reversed, and that we have $\ne$ instead of $=$), another answer containing $(x^m)^n = x^{mn}$ etc.. Congratulations! This is really nice and useful! —
Alex M. Nov 16 at 15:15
