Unit I: Lec 4 | MIT Calculus Revisited: Single Variable Calculus

[MrSnobby24]

Hello Mr. Gross:

I have a question ,in the last part of the lecture ,when you showed an easier way of analytically finding delta for a certain epsilon, why did you assume that |x-3| < epsilon? 41:32 fifth line after i.e.

Thank you.

[hgross3comcast]

@MrSnobby24

I didn't assume that |x-3| < epsilon. Rather I think I said that if x is sufficently close ot 3 then x + 1 is sufifiently closed to 4. So we picked a value for epsilon such that when x was within epsilon x was within epsilon of 4.

I'm not sure that this answers our quesiton; so if it didn't write to me at hgross3@comcast.net,

Thanks for your question and I hope you ar enjoying the course.

[anakmudajaman]

I Love The Video Derivatives and Limits It Can Increase My Knowledge

[AntoMelta]

Good, I like that you share this video Derivatives and Limits, I wish success always

[willamricard]

Nice Video Derivatives and Limits That You Share , So Very Nice Thanks You

[imegatrone]

I Really Like The Video Derivatives and Limits From Your

[bundawartini]

Your Video Derivatives and Limits Is Very Useful Sharing

[ngeliatduit]

Very-Very Good Video!

[Spasatcom]

Cool Video. Very-Very Infomations. Thanks MIT

[penyidikanca]

Good Video!! I like This!!

[penyidikanca]

Good Video!! I like this!

[ShandiKarimaxz607]

ehm ich hab was unanständiges entdeckt

[kishangzp]

The first ever video I have seen which properly explains limits.

[flowewritharoma]

great video!

[Iforgetmainame]

omg this is so kool. this guy is kool. math is awesome

[kritika427]

best calculus lectures i ever saw

[mathematicsplusplus]

Brilliant! I am a tutor with a highly motivated student about to enter 8th grade. I will refer him to watch these videos. These kinds of videos will revolutionize education. Prof. Gross, my greatest thanks for putting these videos online. We can really feel your excitement for the subject.

[hgross3comcast]

@mathematicsplusplus Oops. I forget to include my email address which is hgross3@comcast.net.

[aniketkedare8]

Awesome

[quangngy]

The number of people who have seen this video is equivalent to a big high school, which is sad considering the subject matter of this video and the fact that it was free and made readily available to the world...

[hgross3comcast]

Still, over 7,500 people have viewed this video. At 25 students per section and 6 sections per year it would have taken me 50 years to teach 7,500 students. Coincidently my teaching career was 50 years! Moreover I am no longer teaching in the classroom but the videos are there, God willing, in perpetuity. So I truly appreciate your sentiments but try not to fret :) BTW if you’d like to chat with me personally my email address is hgross3@comcast.net

[quangngy]

@hgross3comcast your words have given me hope to a point that I think I want to cry... Thank you for the response, I will finish these videos and other OCW videos and continue to work hard for just and noble reasons, because I have learned through example from people like you that a man shouldn't be measured on how smart or strong or talented he is but how hard he works for love and truth.

[richter85]

this guy is admirable

[ybarrarog]

Thank you!

[Ghaiyst]

wow! education is a joke now compared to what it was! i sure wisj i could go back to the 1950's-1960's and learn this stuff. It would make life 50 times easier and enjoyable!

[jeroen360]

@Ghaiyst Im attending school in South Africa (attending last year of high school - im 17), and my class went over all this last year ... haha and the the irony is that we consider our education lack luster >.<

[Ghaiyst]

@jeroen360 HAHA yea! Learning is pretty fun and enjoyable in general, but the way things are taught these seem very less serious and enjoyable than what they made it back in the 1950s-1970s even some of 1980s and 1990s. They don't care if we learn it. They care that we not only know it, but do good on tests. It's all about tests which takes away the enjoyment of learning, unless you found a way to enjoy it within itself like me. It would be more enjoyable if there were more people like this guy

[Lemenks]

@Ghaiyst Yea I agree with you. I'v just completed secondary school and I'm going to university now in a few weeks time. I found school so incredibly boring, it was all learning junk off to remember for tests. I find physics really interesting but in school it was so boring. I got a D1 in my mock exames, then I decided to watch youtube videos on it which are so much more interesting and I got a B1. Youtube makes education so much more interesting and you only learn the parts you like.

[shadowC10ne]

Thank you MIT for these videos!

[Citizen695]

Outstanding you are prof Gross. I wish if all your series of mathematics are put for the public including the advance mathematiques. You realy explained the spirit of maths and you simplified amazingly its complexity ! Your course should be the example for teaching maths. Thank you again.

[EclecticSceptic]

Great lecture! Thank you MIT.

[ArtemRomanov]

This link is alive, thanks!

[jimhale777]

Freakin' Awesome. Kinda makes me appreciate my Calc prof. At least he's in color. It's great to see this blast from the past. Say what you will, but I can fully understand what he is saying. Thanks for posting it!

[mathforphysics]

The next video, Part 1 Lecture 5, was "Removed from Youtube by the User." I really wanted to see where he was going. He introduced the epsilon and delta approach in these videos and he was supposed to provide tricks to avoiding that approach in the next video.

[MIT]

@mathforphysics All the videos are back, sorry for the inconvenience.

[mathforphysics]

@MIT

Thank You! 

[hgross3comcast]

@mathforphysics Hi! As I understand it the videos were removed because no one had notced that instead of "Revsited" the video was titled "Revsited". The spelling has now been corrected and corrected video is now uploaded.

[ArtemRomanov]

View the complete course:

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[MIT]

@ArtemRomanov The link has been fixed. It will now take you to the course.

[ArtemRomanov]

@MIT I still can't use it. Page not found. Is there any regional restrictions?

[ian559fresno]

@MIT Great teachers at MIT!