Help with limit proofs for real analysis

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For understanding the formal definition of limits in real analysis, several online resources are recommended. The tutorial from Lamar University provides clear explanations and additional pages on calculating limits. Khan Academy offers helpful videos that can enhance comprehension. Another useful resource is the teaching page from UCL, which contains relevant materials. These resources can effectively supplement missed class content and clarify concepts.
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I'm not quite sure if this is the correct subforum. I was wondering if anybody knew where I could find some decent real analysis notes or lectures online, specifically on the formal definition of a limit. My prof is great, I just missed the class and the textbook and notes aren't quite making it clear.
 
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Those are great, thanks a lot.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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