Proof for Unions and Intersections of Open Sets | Real Analysis

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We prove the union of a collection of open sets is open, and the intersection of a finite collection of open sets is open. To do this, we use basic set operation properties and the definition of open sets. #RealAnalysis

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Just started this topic in my analysis course. great vid as always

Heuyy
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Is union of finite open sets open?

Is intersection of infinite open sets open?

ThaeThae-hk
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these videos are amazing i would wanna ask for some on cauchy criterion of series🙏🙏

steepe
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Why does the intersection have to be of a finite collection ?

JacemHagui