2.15 The main continuity theorem

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Most common functions are continuous: to compute a limit, we just "plug it in". How do we prove this quickly for a large family of functions all at once?

Related videos:

0:00 Introduction
0:20 Main continuity theorem
1:19 Domain warning
1:48 Proof step 1
3:17 Proof step 2
4:00 Composition teaser
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