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Explore What is Jacobian? | The right way of thinking derivatives and integrals with 2,281,663 views, 63,644 likes, and 1,475 comments. Experience the impact of this video content that has captured audience attention.

Jacobian matrix and determinant are very important in multivariable calculus, but to understand them, we first need to rethink what derivatives and integrals mean. We can't think of derivatives as slopes if you want to generalise - there are four dimensions to graph the function! This video hopes to explain what the Jacobian matrix and determinant really mean, and essentially why they are actually very natural for changing variables; and also explaining something that might be glossed over when you use them - for example, we require absolute value, and the changing variables function is injective. This channel is meant to showcase interesting but underrated maths (and physics) topics and approaches, either with completely novel topics, or a well-known topic with a novel approach. If the novel approach resonates better with you, great! But the videos have never meant to be pedagogical - in fact, please please PLEASE do NOT use YouTube videos to learn a subject. In the video, we have only talked about 2D transformations, but the Jacobian can be easily generalised to any number of dimensions you like - you just need to introduce linear maps in higher dimensions! Think about what that means in 3 dimensions for a start! This video simply aims to introduce the intuition of the Jacobian, and so a lot of things said in the video is not going to be very rigorous - for example, what does approximate mean? It has a specific meaning in mathematics, but we are not getting there; and also not all functions have this nice property of looking like a linear map near a point. These belong to the realm of real analysis, which is well beyond the scope of this video. So please don't shout Fubini's theorem when you see flipping the order of integration at about 17:09. Video chapter feature: 00:00 Introduction 01:20 Chapter 1: Linear maps 06:01 Chapter 2: Derivatives in 1D 08:08 Chapter 3: Derivatives in 2D 13:01 Chapter 4: What is integration? 17:26 Chapter 5: Changing variables in integration (1D) 19:25 Chapter 6: Changing variables in integration (2D) 22:59 Chapter 7: Cartesian to polar If you are interested in thinking about how the formula for the determinant came about, here is it: https://moodle.tau.ac.il/2018/pluginfile.php/403616/mod_resource/content/1/Nelsen%201993%20Proofs%20without%20Words.pdf (p. 134, 135) Other than commenting on the video, you are very welcome to fill in a Google form linked below, which helps me make better videos by catering for your math levels: https://forms.gle/QJ29hocF9uQAyZyH6 If you want to know more interesting Mathematics, stay tuned for the next video! SUBSCRIBE and see you in the next video! If you are wondering how I made all these videos, even though it is stylistically similar to 3Blue1Brown, I don't use his animation engine Manim, but I will probably reveal how I did it in a potential subscriber milestone, so do subscribe! Social media: Facebook: https://www.facebook.com/mathemaniacyt Instagram: https://www.instagram.com/_mathemaniac_/ Twitter: https://twitter.com/mathemaniacyt Patreon: https://www.patreon.com/mathemaniac (support if you want to and can afford to!) Ko-fi: https://ko-fi.com/mathemaniac For my contact email, check my About page on a PC. See you next time!

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