Concept
How many members does the set V contain?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"Consider this set: V = { 3 , 5 , { 5 , 4 } , 2 } . This set has four (not five) members. Three of V ’s members are integers: 2, 3, and 5. The other one is a set (with no name given). That other set, by the way, has two members of its own: 4 and 5. If you were asked, “is 4 ∈ V ”? the answer would be no."
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