Concept
What is the difference between ∅ and {∅}?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"As a corollary to this, there’s a difference between ∅ and { ∅ } . The former is a set with no elements. The latter is a set with one element: and that element just happens to be a set with nothing in it."
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