Concept
How can a set be a member of another set?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"For instance, the set Z of all zebras is a member of R, since Z itself is a set (not a zebra) and so Z / ∈ Z. The set S, on the other hand, defined as “the set of all sets mentioned in this book,” is not a member of R, since S contains itself as a member."
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