# Talk:Empty set

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This page used to say: "Christian scientists and others hold that it is impossible to create something from nothing, casting doubt on the existence of the empty set. However, it remains an important tool among secular mathematicians." I have never heard this, but if I am mistaken, please add it back. I am aware that the empty set has been the subject of discussion by philosophers, and perhaps Christian philosophers in particular. On the other hand, a very common way to specify a set is as the subset of elements of some other set which have a certain property. For example: { x \in the odd integers : x is prime } is the set of odd primes, i.e., {3,5,7,...} on the other hand { x \in the odd integers : x is a multiple of 2 } is the empty set {}. This doesn't seem to be creating something from nothing to me, and the empty set arises very naturally. Have such objections really been raised? --MarkGall 17:15, 2 September 2009 (EDT)

Now is better, I think. --Joaquín Martínez 10:18, 4 September 2009 (EDT)
Please rewrite this so that the easiest points to understand come first, and the advanced points come later. --Ed Poor Talk 00:02, 8 January 2010 (EST)
Thanks. And what is a unique set, and why is this important? --Ed Poor Talk 11:55, 8 January 2010 (EST)