regular space
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topological space in which a point and a closed set are, if disjoint, separable by neighborhoods
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Kolmogorov space
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topological space
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neighborhood
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Hausdorff space
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closed set
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completely regular space
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separated sets
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completely Hausdorff space
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mathematics
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International Standard Book Number
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mathematical analysis
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topology
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point
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theorem
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Andrey Kolmogorov
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subset
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continuous function
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disk
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metric space
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manifold
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