Concept
Can a set containing Han be the same as a set containing another set that includes Han?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"Han } the same as the set { Luke, { Leia, Han } }? No. For instance, the first set has Han as a member but the second set does not. (Instead, it has another set as a member, and that inner set happens to include Han.)"
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