Assuming a 4-level hierarchy of "universe" as posited by Tegmark here...
http://arxiv.org/abs/0905.1283v1

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Then the universe would be an aggregate of all mathematical structures.
On Tue, Dec 29, 2009 at 6:07 AM, Mindey <min...@gmail.com> wrote:
> Hello,
>
> I was just wondering, we are talking so much about universes, but how
> do we define "universe"? Sorry if that question was answered
> somewhere, but after a quick search I didn't find it.
>
> Inyuki
> http://www.universians.org
>
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