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Formally, a function f is a relation between sets A and B such that, for all x in A and u,v in B, f(x) = u and f(x) = v implies u = v. It's just a definition.
by jasomill 1mo ago
Formally, a function f is a relation between sets A and B such that, for all x in A and u,v in B, f(x) = u and f(x) = v implies u = v.
It's just a definition. Authority is, as the parent suggests, any introduction to set theory.
- andriy_koval 1mo ago> Formally, a function f is a relation discussion was if zfc has functions at all, not sure why you put relation here.
- jibal 1mo agoThe guy's remarkable response makes clear that he's a clueless troll.