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- simple past tense and past participle of
- (analysis, of a set) That can be enclosed within a ball of finite radius.
- A compact set must be bounded.
- (set theory, order theory, of a poset X with partial order ≤) That contains a least element, a, and a greatest element, b, such that for all x ∈ X, a ≤ x ≤ b.