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jjslocum3
 2 years ago
Hello, just joining up. Prof. Jerrison is very quick and engaging. I have a question about the proof that differentiability = continuity in lecture 2 (
https://itunes.apple.com/us/podcast/lecture01derivativesslope/id354869053?i=80690404)
 did I miss where it was shown that (the limit as x>z of a*b) is equal to (the limit as x>z of a)*(the limit as x>z of b)? The proof seems to hinge on that. It's certainly an intuitive inference, but is there a simple proof of said inference?
btw, the proof is the last few minutes of lecture 2 in the link referenced above.
jjslocum3
 2 years ago
Hello, just joining up. Prof. Jerrison is very quick and engaging. I have a question about the proof that differentiability = continuity in lecture 2 ( https://itunes.apple.com/us/podcast/lecture01derivativesslope/id354869053?i=80690404)  did I miss where it was shown that (the limit as x>z of a*b) is equal to (the limit as x>z of a)*(the limit as x>z of b)? The proof seems to hinge on that. It's certainly an intuitive inference, but is there a simple proof of said inference? btw, the proof is the last few minutes of lecture 2 in the link referenced above.

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robertehoward
 2 years ago
Best ResponseYou've already chosen the best response.2No you didn't miss it. The lectures did not cover limit laws and I don't think they will. Later the professor shows a geometric proof of sin x / x but doesn't use the squeeze theorem. I guess 18.01 isn't too concerned with rigorous proofs but more about giving us an intuition. It's somewhat annoying to me, but I guess we need to trust the process and if we're concerned with more rigor at this stage, we must go outside the class. Btw, I looked for that differentiability implies continuity and found much more indepth proofs such as : http://people.hofstra.edu/stefan_Waner/RealWorld/calctopic1/contanddiffb.html at the bottom of the page.

JingleBells
 2 years ago
Best ResponseYou've already chosen the best response.0Also check out Albert Strang's Highlights of Calculus, I found it really useful: http://ocw.mit.edu/resources/res18005highlightsofcalculusspring2010/index.htm

jjslocum3
 2 years ago
Best ResponseYou've already chosen the best response.0thanks for your replies guys, very helpful!
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