Talk:Union of Countable Sets of Sets

Union of Countable Sets depends on AC, shouldn't one rather put up an argument like for the proof that $\Q$ is countable? It may at least be worthwhile to put that up as a second proof. --Lord_Farin 18:01, 14 February 2012 (EST)
 * If you like. --prime mover 01:07, 15 February 2012 (EST)