second-countable space
Sign in to saveAlso known as completely separable space, second axiom of countability
topological space whose topology admits a countable base
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metrizable space
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quotient topological space
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mathematics
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International Standard Book Number
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topology
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rational number
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continuous function
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Euclidean space
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metric space
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topological space
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manifold
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cardinality
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algebraic topology
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ball
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Poincaré conjecture
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Klein bottle
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countable set
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open set
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image
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Euler characteristic
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