Concept
Why is the relation not a function?
Stephen Davies, Ph.D. Version 2.2.2 Through Discrete Mathematics A Cool Brisk Walk / Chapter 1
"A as the set { Chuck, Julie, Sam } and S as the set { basketball, volleyball }. Then we defined the relation { (Julie, basketball), (Sam, basketball), (Julie, volleyball) }. Is this relation a function? No, because it’s missing Chuck entirely."
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