upward directed set
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preordered set whose every finite subset has an upper bound
Connections
partially ordered set
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series
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net
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sequence
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topological space
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total order
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ordered field
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upper and lower bounds
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well-founded relation
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preorder
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greatest and least elements
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ordered group
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theory
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semilattice
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complete partial order
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weak ordering
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ordered vector space
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mathematics
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International Standard Book Number
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natural number
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