Let S={1,2,3}. Then ∅⊆ S. Why is this true? ∅⊆{∅}. Why is this true? The set {x∈ ℚ : 2x2 - 7x- 4 =0}. How come this one has 2 elements instead of 1? Thanks.
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Originally Posted by naturebuilder Let S={1,2,3}. Then ∅⊆ S. Why is this true? ∅⊆{∅}. Why is this true? The statement that means that So for any set it is true that
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