ideal
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in order theory, a nonempty, upward‐directed, downward‐closed subset of a preordered set
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partially ordered set
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ideal
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lattice
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infimum and supremum
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ordered field
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well-founded relation
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ordered group
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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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topology
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digital object identifier
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abstract algebra
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empty set
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Q180686
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bibcode
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isomorphism
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Q118398
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