Concept
What subset relations involve ∅ and Ω?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"14. Is ∅ ⊆ S ? Yes, since the empty set is a subset of every set. 15. Is ∅ ⊆ ∅ ? Yes, since the empty set is a subset of every set. 16. Is F ⊆ Ω ? Yes, since every set is a subset of Ω . 17. Is F ⊂ Ω ? Yes, since every set is a subset of Ω , and F is certainly not equal to Ω ."
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