The Fundamental Theorem of Line Integrals // Big Idea & Proof // Vector Calculus

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Back in 1st year calculus we have seen the Fundamental Theorem of Calculus II, which loosely said that integrating the derivative of a function just gave the difference of the function at the endpoints. That is, what happened in the middle did not matter. In this video we upgrade to the Fundamental Theorem of Line Integrals, which is a generalization of the Fundamental Theorem of Calculus. It says that when you take the line integral of a conservative vector field (ie one where the field can be written as the gradient of a scalar potential function), then this line integral is similarly just the difference of the function at the endpoints and is thus path independent - only the endpoints matter. In this video we will motivate this theorem, prove it formally, and connect the idea back to that of conservative vector fields.

0:00 FToC
1:24 Fundamental Thm of Line Integrals
2:50 Proof
5:33 Conservative Fields

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Fantastic video, yet again. The mean on my first midterm at college was a 76 and I got a perfect score because of you!

andrewkoulogeorge
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who's here a day before their endsems of Calculus?

ishaanmanhar
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The real question is...where'd you get that shirt?! (it looks amazing)

narenmani
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As a physics student I find it very interesting since I've been wondering about how to "undo" the gradient to find the potential function related to a certain force field, so imagine this might be the answer, isn't it?

Sorry for any grammar mistake English is not my first language
Btw nice t-shirt.

Alannnn
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This proof is so straightforward. Thank you!

nuralddd
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Ur class really gives a visual feeling of whats really going on.Superbb.I really love ur classes

muaadakmal
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These videos really help me for olymp physics.

Thanks.

Fizikakaalda
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God I keep coming back to this video. You are fantastic

hydropage
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Damn. you guys are flying. We just finished multiple integration. Starting vector calculus next week.

rmbennet
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This guy will drag me kicking and screaming to an A in my vector calc class

arielfuchs
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Love from India, and thanks for saying u used Thomas calculus which is the same used for us in classes I'm from nitw

kandagaddalavenkatakiransu
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Love your shirt! Do you know where I could buy one?

brownruns
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Dr. Trefor Bazett, thanks. Super clutch

matthewmoser
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Just a thought but adding differential forms as an extension of Stoke's Theorem could really help. It was in my calc 4 course and really helped me solidify the ideas. Thanks for all your help this semester!

eszentmiklossy
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Where did you get your shirt? It’s pretty cool :P

WallaceGromit
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Jajajaja I'll need this for monday, can't thank u enough.

juanmanuelmillansanchez
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Excellent presentation of this topic! You certainly rival Sal Khan ....

bulldawg
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Hi Dr. Trefor Bazett, do you have a link to the book you mentioned? I'm deeply interested in it.

imaginary
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First off nice 👕 it'll be useful to learn some 🆒️🕺🏻💃🏻 moves alongside the corresponding functions beneath 😛

Now regarding the 📽 I 🧡 that you take a theoretical approach with a great presentation & animations to clearly explain the concepts. I would only want to ask you to include just a single & simple ℝ🌎 example to finish understanding the concept.

I'll 🗣 you a situation I've faced here. You've got several 📽 where an arc length parameterization in "s" is suggested.... but I'm yet to 👀 how that parametrization is actually done. You even have an example there where you use a function for a ⭕ but that one is parameterized in "t" instead of "s"

And for that lack of an example regarding how to actually get the arc length parametrization I find somewhat ℂ to understand how to apply the results you get 😥

Finally... will you cover differential forms which can generalize Green & Stokes theorems 🙏🏻❔

MarPabl
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Another outstanding explanation - you refer to a textbook - could you give me the reference please?

markpadley