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open set
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International Standard Book Number
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metric space
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topological space
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cardinal number
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countable set
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disjoint sets
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Springer Science+Business Media
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partially ordered set
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order theory
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total order
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separable space
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product topology
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Lindelöf space
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American Mathematical Monthly
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Mikhail Suslin
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cofinality
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forcing
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Martin's axiom
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Kenneth Kunen
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