Concept
What is the cardinality of a set?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"When we talk about the number of elements in a set, we use the word cardinality. You’d think we could just call it the “size” of the set, but mathematicians sometimes like words that sound cool. The cardinality of F (the set of females, where the Davies family is the domain of discourse) is 3, because there are three elements in it. The cardinality of the empty set ∅ is 0. The cardinality of the set of all integers is ∞. Simple as that."
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