On Thu, Mar 30, 2017 at 3:39 PM, Robert Bennett via swift-evolution < [email protected]> wrote: > > > (for instance, mathematical sets may contain anything at all, including > themselves)
Well actually they can’t <https://en.wikipedia.org/wiki/Axiom_of_regularity>, for…reasons <https://en.wikipedia.org/wiki/Russell%27s_paradox> :-) Nevin
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