402.3B1 Open Sets in the Standard Metric Topology
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402.3A2 Isolated Points and Discrete Sets
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Taste of topology: Open Sets
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402.3A3 Boundary Points of a Set
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3 - Open and closed sets
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Proof that the Intersection of any Finite Family of Open Sets in the Standard Topology on R is Open
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402.3A4 Accumulation Points and Closure of a Set
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The best A – A ≠ 0 paradox
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