KnowraZermelo–Fraenkel set theoryLinked fromLinked fromThe 47 pages that link to Zermelo–Fraenkel set theory, each with the reason it gives.All 47Broader topic 7Related 17Narrower topic 21Compared with 2Peano axiomsCompared with: It can construct the natural numbers as sets rather than taking them as primitive objects.New FoundationsCompared with: Unlike New Foundations, it does not admit a universal set.