Proof for Unions and Intersections of Open Sets | Real Analysis

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

Intro to Open Sets:    • Intro to Open Sets (with Examples) | ...  

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Real Analysis exercises:    • Real Analysis Exercises  

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