Curl, Circulation, and Green's Theorem // Vector Calculus

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his video is all about Green's Theorem, or at least the first of two Green's Theorem sometimes called the curl, circulation, or tangential form. Consider a smooth, simple, closed curve that encloses a region in the 2D plane, together with a Vector Field. One thing we could do is compute the circulation along that curve, which would be a large-scale or global property. Separately, at any point in the enclosed region we could compute the circulation density or curl at that point, which is a small-scale or local property. The power of Green's Theorem is that it relates these two concepts. The circulation or line integral along the curve (i.e. which only depends thus on the boundary of the region) is equal to the double integral over the entire region of the circulation density. Amazing!

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0:00 Curl vs Circulation
1:48 Derivation
5:00 Green's Theorem

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The reason behind this channel being underrated is..that most of the students just study for marks not for the concepts (schools has made them like this) are very few people who look for intuition of the concept...and sir u are a blessing for us...love from india🇮🇳

KHUSHBUKAPOOR-gkix
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For me a physics student, this channel I just found is a goldmine...
You can´t imagine how poorly math is lectured by our professors.
Thank you and all the other great youtube channels like 3blue1brown!!

leon_noel
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Undoubtedly the best educational math channel on YouTube.
I finally understand the intuition behind all of formulas in my calc lectures, makes it a million times more interesting (and MUCH easier to remember)!
Thanks for the amazing content!

benjaminyellin
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Great lecture again - I used to think Green's theorem was difficult - you just made it easy!

markpadley
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you're a wizard man, these videos are so clear I find myself knowing the next sentence sometimes before you even said it. Thank you.

rodrigoteresa
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Best explanation of all YouTube videos on circulation in a very small area. congrats. After this video, line integral concept is much easier. You articulate well and presentation sequence is very logical and understandable.

rhke
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The best ever channel to learn vector calculus....

scimathist
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You are the greatest teacher of all time with the amazing graphical representations and concepts!!!

fridmamedov
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Sir you have no idea how much your videos helped me i am really thankful to you

surendrachary
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The moment when you mentioned the relationship between Integration as the area calculation and yet determining something which is just confined to the boundary kinda made me pause the video and think for a few minutes! A hell of an insight there.

ashutoshaman
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This is absolutely the best explanation of Green's Theorem

steveying
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The last misconception mentioned in the video was totally my confusion! Thx for solving this problem, and now Im really clear whats green theorem is talking about! Great video!

zimowang-zxyg
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These are the best math videos on the internet. Very good for studying for math exams. I'd be happy though if there was a good stochastics lecture for undergrad.

jamesbra
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This is why I like your approach- visual and intellectual

Ppooh
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I remember watching this for the first time during my calc 3 time. I hadn't seen a more perfect and easy to understand explanation than this. Being able to visualize calculus makes it so much more fun. Coming back and rewatching it now makes it all nostalgic. Thank you Dr Bazett!

Ken-xwlm
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It makes sense how the middle circulation impacts the outer. Compare it to water moving in a circle, if you begin stirring in the opposite direction inside the circle, if would affect the inner flow. Question for myself: The left part of the equation is the circulation around the edge, while the right is the circulation in the middle (as well as on the edge). Why are they the same? Must be because it's not circulation in the middle, but circulation density, which is how much it circulates in a given area. Times it by the size of that area and you only get the circulation. The definition of circulation is "The amount of force that pushes along a closed boundary or path". It's the total 'push' you get when going along a path, such as a circle. So by computing all the small spinning propellers inside an area, you can find the force that's exerted at only the edge of that area. I assume the same way you could change the area, and through knowing the circulation density, you could predict the force needed to go through that line. Thus, is you know the circulation density anywhere, you can calculate the force needed to transverse any simple and closed path.

j.o.
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brilliant analogy to the fundamental theorem of calculus in the end. thank you 😊

mohamedmouh
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Thank you sir for again making maths interesting for me❤
Love from India 🇮🇳

DH_Arts
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Eloquent and really great intuitive professor thank u!

dr.mohamedaitnouh
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These videos are pure gold. The derivations and intuition are top notch

brunof