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Oct 16, 2016 at 5:33 comment added RodolfoAP @m-wiley Give you +1. As said on my answer (Theory of Systems). Systems are just groups existing in our mind. There can be a paradox about the absolute group, but it does not prevent our mind to create the concept of {*}. In relation to the universe, or the atom, we don't know the real minimum and maximum groups, and universe or elementary particle are common terms to refer to it.
May 20, 2016 at 14:44 comment added Jeff Y That is a pretty bankrupt definition of "universe".
May 20, 2016 at 14:05 comment added user5172 The set of all sets doesn't exist -- by Russell's Paradox. en.wikipedia.org/wiki/Russell%27s_paradox
Feb 20, 2016 at 8:45 review Late answers
Feb 20, 2016 at 9:03
Feb 20, 2016 at 8:27 history answered M Willey CC BY-SA 3.0