Definition talk:Set Union/Countable Union

Please, then, explain why its use is strongly discouraged, and by whom. Do you have sources for that claim? Or is that just a matter of personal preference we needn't concern ourselves with? --Dfeuer (talk) 18:15, 2 April 2013 (UTC)

Can't remember now, when I come across the place where I found this piece of advice I'll update the page accordingly. Might have something to do with the general distrust some sources have for the $\infty$ symbol. It doesn't matter enough to require it to be tidied up at the moment. --prime mover (talk) 18:55, 2 April 2013 (UTC)