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Concept · Foundations
An object belonging to a set; if x is an element of the set A, we write x ∈ A, and if it is not, we write x ∉ A.
Why it matters
Membership is the one primitive relation of set theory, and every other notion in the unit is defined in terms of it.
Where this shows up
Following the links will take you to the page where this term is introduced in context.
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