Borel set
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http://youtube.com/watch?v=cPffTkuotHY
If you find our videos helpful you can support us by buying something from amazon. • https://www.amazon.com/?tag=wiki-audi... • Borel set • In mathematics, a Borel set is any set in a topological space that can be formed from open sets (or, equivalently, from closed sets) through the operations of countable union, countable intersection, and relative complement.Borel sets are named after Émile Borel. • -Video is targeted to blind users • Attribution: • Article text available under CC-BY-SA • image source in video • • • Borel set
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