Concept
Is { Yoda } ∈ J ?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"∈ J ? No. Yoda is one of the elements of J , but { Yoda } is not. In other words, J contains Yoda, but J does not con- tain a set which contains Yoda (nor does it contain any sets at all, in fact)."
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