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second countability is hereditary∗ matte† 2013-03-21 19:24:50 Suppose X is a second countable topological space and A is a subset in X. Then A (when equipped with the subspace topology) is also second countable. ∗ hSecondCountabilityIsHereditaryi created: h2013-03-21i by: hmattei version: h37208i Privacy setting: h1i hTheoremi h54D70i † This text is available under the Creative Commons Attribution/Share-Alike License 3.0. You can reuse this document or portions thereof only if you do so under terms that are compatible with the CC-BY-SA license. 1