Lagrange Multipliers | Geometric Meaning & Full Example

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Dr. Trefor Bazett

Dr. Trefor Bazett

Күн бұрын

Пікірлер: 476
@BloobleBonker
@BloobleBonker 3 жыл бұрын
At the age of 66 after trying to understand Lagrange multipliers since the age of 18, I think I've finally got it. Conturs and gradients. Excellent graphics!
@raulsimon2218
@raulsimon2218 2 жыл бұрын
I could say practically the same. Thank you very much.
@asdfbaseqsfawefbaef7738
@asdfbaseqsfawefbaef7738 Жыл бұрын
Hahaha! Such a great comment! You are amazing!
@KSM94K
@KSM94K Жыл бұрын
Wow that's absolutely satisfying
@fraserpye9667
@fraserpye9667 Жыл бұрын
unlucky
@kevinbyrne4538
@kevinbyrne4538 Жыл бұрын
Same is true for me -- but I'm 69.
@gamingmonts9737
@gamingmonts9737 3 жыл бұрын
by just seeing that graph, I immidiently understood something my professor talked about for 2 freakin hours 😂
@john.z3822
@john.z3822 3 жыл бұрын
now i understood something my teacher talked about for 1 mounths lol
@hubenbu
@hubenbu 2 жыл бұрын
Stop it man, if you're no longer hungry after eating 2 pizzas, remember to pay respect to the first one.
@grapplerart6331
@grapplerart6331 2 жыл бұрын
@@hubenbu If the first pizza was a 5" when I ordered a 13", I wouldn't pay respect to the first one
@raptor2245
@raptor2245 Жыл бұрын
😂lol
@themasstermwahahahah
@themasstermwahahahah Жыл бұрын
Bruh, ikr
@shemsnow3711
@shemsnow3711 3 жыл бұрын
I think you're the first person I've ever heard explain math without either focusing too much on precise definitions and proofs that no one cares about or just expecting us to memorize formulas. Nice step by step relevant instructions. Very nice.
@lorentzianmanifold718
@lorentzianmanifold718 2 жыл бұрын
Uhmm that describes pretty much all math channels on KZbin lol
@yousafe007
@yousafe007 2 жыл бұрын
@@lorentzianmanifold718 All good ones, that is....
@MUMM_XYZ
@MUMM_XYZ Жыл бұрын
Definitions and proofs are important, you will never understand math without them
@DadicekCz
@DadicekCz Ай бұрын
Without proofs and definitions it's literally just trust me bro
@xiadanji
@xiadanji 4 жыл бұрын
Mr. Bazett, I think this version of explanation is the best one in whole KZbin, thank you very much!!!
@markbell8967
@markbell8967 3 жыл бұрын
I agree
@Septumsempra8818
@Septumsempra8818 3 жыл бұрын
By far
@cauchyschwarz3295
@cauchyschwarz3295 3 жыл бұрын
3blue1brown`s one is way better. But it is hard to beat 3blue1brown. All in all a good video.
@brucemurdock5358
@brucemurdock5358 2 жыл бұрын
The internet is a blessing, because of people like you
@nathanborak2172
@nathanborak2172 3 жыл бұрын
This is not the way I have usually thought about it but it's equivalent. The way I've usually thought about it is that you imagine walking along the constraint and observing the gradient of f as you go. If the gradient of f has any component along the constraint, it means you can keep walking along the constraint and get higher (or lower) values of f, since the directional derivative is just the component of gradf(f) along the direction you're moving. Therefor you keep walking around the constraint until you reach a point where the gradient of f is normal to the constraint, since at this point f is instantaneously not changing. To me this is more intuitive than thinking the level curve of f should be tangent to the constraint, even though the gradient of f being normal to the constraint IS the level curve being tangent to it. Different strokes I guess.
@sandroelful
@sandroelful 3 жыл бұрын
Genius answer, you helped me a lot. Thank you.
@nathanborak2172
@nathanborak2172 3 жыл бұрын
@@sandroelful thanks! You made my day
@mackenziemurray9270
@mackenziemurray9270 2 жыл бұрын
Wow I like the way your brain works!
@vishvakravichandran6797
@vishvakravichandran6797 Жыл бұрын
Been trying to understand this for a while and you totally helped me!
@offtheleash6440
@offtheleash6440 Жыл бұрын
This is genius
@Aruuuq
@Aruuuq 5 жыл бұрын
Such a nice video. Very enthusiastic presentation. The graphics are some of the most explanatory one for Lagrangian Multipliers that I've ever seen.
@firsttnamee3883
@firsttnamee3883 4 жыл бұрын
@@DrTrefor 5:54 could you explain why the gradient is always normal to the level curve ? you have any video on that ?
@sashamuller9743
@sashamuller9743 4 жыл бұрын
@@firsttnamee3883 ya he has a video called gradient vector or something like that just search in his multivariable course
@firsttnamee3883
@firsttnamee3883 4 жыл бұрын
@@sashamuller9743 yes. Thank you. i got that
@abhinavsharma3188
@abhinavsharma3188 3 жыл бұрын
Every person who has ever taken an optimization course should see this short video! It gives you so much mathematical intuition to the concept of constraints and Lagrange multipliers!
@tedskins
@tedskins 4 жыл бұрын
Thank you very much. I find that geometric interpretations of math concepts often make it significantly easier for me to understand
@zahraazad8441
@zahraazad8441 3 жыл бұрын
me too
@THELORDVODKA
@THELORDVODKA 3 жыл бұрын
I think Geometric interpretation is the whole point of it. The "discoverer" of it probably thought of it in this way itself, it is as if spirit joins othervise empty shell. Even though mathematicians like to portray these stuff on less visual basis, more "universal" logical one, this is how visionaries think in my opinion.
@mastershooter64
@mastershooter64 3 жыл бұрын
@@THELORDVODKA complex analysis: *hello there*
@THELORDVODKA
@THELORDVODKA 3 жыл бұрын
@@mastershooter64 It really isn't hahaha
@ayushthada9544
@ayushthada9544 3 жыл бұрын
I feel whenever I need to brush up on my knowledge of calculus, I always end up on your channel. Your channel is a great learning resource. Thanks for posting these videos. Wish you were teaching Differential Geometry of Manifolds.
@xanderx8289
@xanderx8289 7 ай бұрын
man. you rock! finally, someone who actually TEACHES! not reads a precooked textbook rigid abracadabra.
@marflem12
@marflem12 2 ай бұрын
Age 60 and never got this lambda business before. Great teacher.
@absolutedesi5899
@absolutedesi5899 18 күн бұрын
I have a mathematics 1 exam in 12 hours and this 10 minute video saved me the multiple hours I'd have taken to try and understand this
@kasyapdharanikota8570
@kasyapdharanikota8570 4 жыл бұрын
best professor teaching maths ,great explanation , very thankful to you
@matjul27
@matjul27 2 ай бұрын
Taking multivariable calculus right now and I can’t stand when I have a lecture that is super long for absolutely no reason without even taking the time to explain some intuition. This video is great for the intuition thank you
@borannchanrathnak8256
@borannchanrathnak8256 3 жыл бұрын
Thanks for your explanation, Dr. Trefor Bazett. I was trying to imagine the stuffs in my head and it didn't work until I came here to see your graph visualization. Thumb up for your great work.
@Stan-san
@Stan-san 3 ай бұрын
I saw this 9 years ago in university and needed a refresher, this is amazingly well explained.
@ankitparashar6370
@ankitparashar6370 3 жыл бұрын
The 3D visualization helped a lot. One of the best explainations on internet.
@lewiduressa
@lewiduressa 2 жыл бұрын
Your videos are REALLLLLYYYY helping me understand my Calc 3 class concept, and you explain it way better than my teacher. Thank you!!
@everelement1092
@everelement1092 4 жыл бұрын
Man, this video deserves more views and likes. I definitely need these 3D graph to understand it.
@DrTrefor
@DrTrefor 4 жыл бұрын
Glad the graphs helped!
@muhahaha153
@muhahaha153 2 жыл бұрын
i already passed my analysis 2 exam but i never understood what i was doing when using langrange multipliers, i just learnt how to use it. Now i finally understand what i have been doing all the time thx
@marvellousngidi3765
@marvellousngidi3765 3 жыл бұрын
This is one of the "insane" videos I have ever seen on Lagrange multipliers🙌. You inspire me, keep saving the world 👏👏
@Eric-xh9ee
@Eric-xh9ee 2 жыл бұрын
I usually don't "like" videos but this is an excellent video, so I gave you a thumbs up! Thank you, Professor!
@Love2ne1BigBang
@Love2ne1BigBang 4 жыл бұрын
Thank you so much for this perfect visual representation of the Lagrange multipliers! I was so use to doing the same calculation techniques without really understanding what they mean and you just clarified everything!
@jrt6722
@jrt6722 5 жыл бұрын
Thank you so much, this is on my entrance exam to Japanese University
@SwabhimanTripathy4331
@SwabhimanTripathy4331 2 жыл бұрын
Graphs help to visualise far better than asking to do self - imagination that may be error-riddened. I hope this video reaches to all those who truly want to learn this concept.
@155mushfiqurrahman5
@155mushfiqurrahman5 3 жыл бұрын
Your explanation is really excellent ever i see on multi variable calculus....may Allah increase your knowledge more
@abhipriyeshukla5431
@abhipriyeshukla5431 4 жыл бұрын
this video definitely deserves nobel prize
@Festus2022
@Festus2022 4 жыл бұрын
This is the best explanation of the Lagrange multiplier I could find online. Thanks. Nice graphics!
@DrTrefor
@DrTrefor 4 жыл бұрын
Glad it helped!
@slurperslurpslurp2670
@slurperslurpslurp2670 4 жыл бұрын
Absolutely wonderful, thank you!!! I saw other explanations without showing geometry and using too many jargon that are much longer and fail to explain the simple method. Thank you!
@mdmijanurrahman9695
@mdmijanurrahman9695 4 жыл бұрын
I wish I had watched your video 4 months ago. This would make my life a whole lot easier. Anyways, watching now will also help me in my exam. You are amazing. I wish you all the best.
@DrTrefor
@DrTrefor 4 жыл бұрын
Good luck on your exam!
@themasstermwahahahah
@themasstermwahahahah Жыл бұрын
Jesus Christ, just seeing the two gradient vectors makes it immediately obvious why this works! I have been staring at equations when all I needed was teo pictures This is amazing!
@edwarddi3833
@edwarddi3833 4 жыл бұрын
man, with the help of your video, simply save 50% of my study time for struggling in the textbook.
@edwarddi3833
@edwarddi3833 4 жыл бұрын
Hi, Trefor, could you please explain in your 3D graph about the difference between the graph of f(x,y)=x²+y² and f(x,y,z)=x²+y²+z² ?
@GoutamDAS-ls1wb
@GoutamDAS-ls1wb 3 жыл бұрын
Fantastic use of computer graphics to explain concepts. Lots of hard work. Thank you so much!
@mathveeresh168
@mathveeresh168 4 жыл бұрын
His beard is as good as his explanation
@fireemblem2770
@fireemblem2770 3 жыл бұрын
YESSSS that is an amazing beard
@nitika9769
@nitika9769 11 ай бұрын
you keep me motivated to do what i am doing, by showing how beautiful math is , im so grateful for having people like u
@bentaakinyi2248
@bentaakinyi2248 3 жыл бұрын
Thanks Dr for the clear and precise explanation.It is the best so far I have seen regarding Lagrange Multipliers.Very Intuitive!!This is what we need in Mathematics ,not just formula.Thanks once more!
@bobbymcgeorge
@bobbymcgeorge 2 жыл бұрын
First off Trefor : I want to say that you are beautiful and I love you! Second Off (ly) : Your series on Multivariable Calculus is a superb compliment to Denis Auroux's (also superb) MIT course on Multivariable Calculus. Your graphical representations of the problems are so much better than what was available in 2007. Many thanks
@knk8192
@knk8192 4 жыл бұрын
Sir, You are the greatest explainer I have ever seen.
@DrTrefor
@DrTrefor 4 жыл бұрын
Wow, thanks!
@emerald_eyes
@emerald_eyes 8 ай бұрын
God bless you, I've been trying to understand this for hours. You explained it so elegantly.
@chethanar8274
@chethanar8274 3 жыл бұрын
Such a wonderful explanation. You are the ones who prove that math is interesting. Thank you so much.
@DrTrefor
@DrTrefor 3 жыл бұрын
You're very welcome!
@sushantgarudkar211
@sushantgarudkar211 10 ай бұрын
You are at maximum respect for me with constraint that I got entire concept so easily. Thanks a lot for the video and efforts you along with maybe your team if you have it put in to create such content along with matching and timed visuals! Superb Explanation!
@RespectThePouch1028
@RespectThePouch1028 3 жыл бұрын
My textbook had the same explanation, but your visuals and simultaneously lucid explanation finally helped me start to get it. Thank you!
@DrTrefor
@DrTrefor 3 жыл бұрын
Glad it helped!
@yarenkaya7872
@yarenkaya7872 3 жыл бұрын
I honestly needed this great intuition, thank you sir for the demonstration
@parkjessica4444
@parkjessica4444 3 жыл бұрын
love your passion in math and it definitely motivates me! thank you, thank you, thank you!!
@brianwilson3656
@brianwilson3656 2 жыл бұрын
I second all these comments. Wonderful example and wonderful enthusiasm! Thank you
@briandwi2504
@briandwi2504 2 жыл бұрын
A joy to listen to your explanations. Lovely bit of maths!
@Harry-ub2fv
@Harry-ub2fv 4 жыл бұрын
Most beautiful explanation on Lagrange Multipliers.
@laminjatta3378
@laminjatta3378 5 жыл бұрын
You deserve a noble prize 🤝
@sanfinity_
@sanfinity_ 5 жыл бұрын
There should be one as math is the queen of science🤔
@denali9455
@denali9455 2 жыл бұрын
my midterms tmr, thank u so much dude, made this intuitive
@anish_cr
@anish_cr 4 жыл бұрын
the great graphical representation made it very easy to understand. thanks for the enthusiastic explanation.
@oliviab6415
@oliviab6415 4 жыл бұрын
Dr. Bazett! Amazing work! Very concise and clear, graphics were incredibly helpful! My Calculus 3 teacher recommended this video on our lesson and I feel so enlightened. Thank you for your contribution, and keep up the great work.
@DrTrefor
@DrTrefor 4 жыл бұрын
Thank you!! Can I ask what school you are at? Always love when I get a teacher recommendation:)
@todianmishtaku6249
@todianmishtaku6249 2 жыл бұрын
@@DrTrefor First off, let me express my deep gratitude about this great explanation. Many tutorials seem to skip important moments in explaining the geometric intuition behind the main equation of scalar multipliers. Still I have something unclear. When we say that the gradients of f and g have the same direction, it seems to imagine them lying in the same plane; and, this plane is the same where the contour line of f lies in. Isn't it like this? If so, it is obvious that two vectors that lie in the same plane and are perpendicular to the same straight line, then they are parallel one to another. BUT, the gradient of f in fact does not lie on the plane defined by contour line; it is a vector in 3D space (which, for instance, points to the top of hill). How do we know that the gradient of g at the tangent point is parallel with the gradient of f? Or when you say that the contour line of f and the one of g are tangent, do you have in mind a common tangent line or a common tangent plane? You show that real gradients in 3D are "projected" into 2D. In other tutorials, people see just the ones in 2D and then the analysis that gradients are collinear is quite easy because the analysis about parallelism seems to be based on 2D, but as I mentioned above my concern is related to the fact that the real gradients we put in the equation are in 3D; hence showing their parallelism remains a bit unclear. In other words, when we say that the gradient of f is perpendicular to f, that can be true even if the gradient does not lie on the plane defined by the contour line. Could you please shed more light on these "paradoxes" (which may be only my paradoxes) ? Could you please draw both gradients (for the f and g) on the graph of the left side? Could you please pick up two or more g functions?
@adrianrivero6104
@adrianrivero6104 3 жыл бұрын
That explanation about the tangent gradients was very clear and helped me a lot. Thanks
@JamesKim-f9c
@JamesKim-f9c 9 ай бұрын
Excellent video Trefor. Not to be pedentic, but @7:02, you have ▽f and ▽g on the top right side... on the bottom left side, the gradient vectors should be -▽f and -▽g since they are in the opposite direction.
@gratux
@gratux 18 күн бұрын
the gradient is itself a function, so it doesn't have to point in the same direction everywhere. if you plug the two points into grad(f) and grad(g), you indeed get the shown vectors, no negative required.
@RajivSambasivan
@RajivSambasivan 3 жыл бұрын
Wow! what a fantastic explanation of lagrangian multipliers. The best I have seen. Amazing.
@DrTrefor
@DrTrefor 3 жыл бұрын
Thank you!!
@daggerdeadshot1694
@daggerdeadshot1694 3 жыл бұрын
Love from india sir keep on the good work ...education learning wisdom unites people
@johnholme783
@johnholme783 2 жыл бұрын
An explicit lecture on Lagrange multipliers! Thank you!
@stockman3316
@stockman3316 3 жыл бұрын
This guy is amazing! He should have more subscribers!
@DrTrefor
@DrTrefor 3 жыл бұрын
haha i wish!
@suheladesilva2933
@suheladesilva2933 3 ай бұрын
Brilliant Dr. Trevor, thanks a lot for your excellent explanation.
@sniperwolf50
@sniperwolf50 3 жыл бұрын
9:05 Not the focus of the video, but a slightly neater approach is to square the first and second equations and sum them up resulting in x² + y² = 4λ²(x² + y²). By the third equation, it follows immediately that λ² = 1/4. Then, proceed the same as before.
@Trangnguyenbookclub
@Trangnguyenbookclub 3 жыл бұрын
you save my world Dr Trefor!
@irenepadre3352
@irenepadre3352 3 жыл бұрын
you are just the best math prof out there!!
@ksheersagaragrawal9104
@ksheersagaragrawal9104 4 жыл бұрын
most appropriate video to get to know the idea behind this theorom
@glory6998
@glory6998 3 жыл бұрын
This channel is gold 💙💙💙
@mackenziemurray9270
@mackenziemurray9270 2 жыл бұрын
Thanks for this video! My calc teacher assigns us your videos to watch and we love your graphics!
@debayanmitra3729
@debayanmitra3729 2 жыл бұрын
Brillinatly explained.
@sinasoltan.m4859
@sinasoltan.m4859 4 жыл бұрын
Thank you so much.one of your 10 minutes videos is better than 10 years of studying at university😀
@user-ex6xc5ox3k
@user-ex6xc5ox3k Жыл бұрын
Damn, this is exactly what I was looking for. Wonderful explanation!
@johannesvanm.3467
@johannesvanm.3467 Жыл бұрын
Time and again you are so incredibly helpful, Dr. Bazett.
@StratosFair
@StratosFair Жыл бұрын
You definitely have a gift for teaching, thank you for sharing it with the world
@hiddekemperink9407
@hiddekemperink9407 3 жыл бұрын
I passed my calc 2 exam thanks to this guy
@orangehat1924
@orangehat1924 2 жыл бұрын
Explained Beautifully, bravo!
@tanishmadaan7029
@tanishmadaan7029 19 күн бұрын
Brilliant explanation!!! thank you sir...
@tommygokes
@tommygokes Жыл бұрын
This helped so much with my homework! Thank you! My professor in college is awful at teaching, but you're amazing at it
@freedomofmusic2112
@freedomofmusic2112 2 жыл бұрын
for the algorithm! love your videos Dr. Bazett!
@shwephyusinmoe5068
@shwephyusinmoe5068 8 ай бұрын
Thank you for your explanation,Sir!😊
@ManishMiglani
@ManishMiglani 2 ай бұрын
Excellent way to explain this!
@HermanToMath
@HermanToMath 4 жыл бұрын
I finally know the whole story...... thanks a lot!
@DrTrefor
@DrTrefor 4 жыл бұрын
Glad it helped!
@JFASACM
@JFASACM 4 жыл бұрын
A natural professor! Thank you, sir!
@DrTrefor
@DrTrefor 4 жыл бұрын
Thank you kindly!
@vishank7
@vishank7 3 жыл бұрын
Can’t thank you enough for this amazing explanation. Please keep up the good work!
@continnum_radhe-radhe
@continnum_radhe-radhe 2 жыл бұрын
Thank you so much sir... 🔥 before seen this video.. this topic looks so complex but now it is easy
@Z4yx
@Z4yx 4 жыл бұрын
Thanks for the graphics, i understand better now.
@abbieeagle5343
@abbieeagle5343 4 жыл бұрын
thank you, you explained what was going on greatly through the diagrams, really helped me out
@catchphraseish
@catchphraseish 3 жыл бұрын
Brilliant explanation. The visual aids help make it more intuitive. Thank you for this!
@DrTrefor
@DrTrefor 3 жыл бұрын
Glad they helped!
@cookieman2028
@cookieman2028 3 жыл бұрын
Wow that visualization is amazing
@inordinaterefraction
@inordinaterefraction 4 жыл бұрын
Thousands of dollars in debt, in the third year of my physics degree, and I come across him: the first boss of my department, the boomer classical mechanics prof who wrote his own pamphlet of a textbook in 1995 and can't teach a dog to sit -- the poor man. Zero idea who you are, but you are singlehandedly preparing me for my exam tomorrow and saving me considerable money -- along with my sanity, my GPA, and my hope.
@DrTrefor
@DrTrefor 4 жыл бұрын
haha, that sounds crazy. Well good luck on the exam!
@arjittripathi5484
@arjittripathi5484 4 жыл бұрын
You have a fantastic way of explanations
@DrTrefor
@DrTrefor 4 жыл бұрын
Thank you! 😃
@thesnakednake
@thesnakednake 2 жыл бұрын
This is an absolutely fantastic video
@matthiastakele
@matthiastakele 4 жыл бұрын
Thank you! You taught it better than my MIT multivariable calculus professor lol
@pllagunos
@pllagunos 4 жыл бұрын
Which professor teaches you 18.02?
@matthiastakele
@matthiastakele 4 жыл бұрын
plls12 Are you an MIT student
@pllagunos
@pllagunos 4 жыл бұрын
Matthias Takele Nope, I applied to the transfer program so hopefully I’ll get in. I ask because I am watching 18.02 on OCW by Denis Auroux and so far he’s been phenomenal
@matthiastakele
@matthiastakele 4 жыл бұрын
@@pllagunosWell Larry Guth teaches 18.02 but because of the coronavirus, he is no longer able to go back on campus to record lectures. So for that reason, everyone in the class is going to use OCW to also watch Denis Auroux
@robertoberidojr.435
@robertoberidojr.435 3 жыл бұрын
Sir your graphs and visual aids are beautiful. It's what set you aside from other professor
@jamyllecarter3016
@jamyllecarter3016 4 жыл бұрын
Beautiful visualizations. Thank you!
@timothypulliam2177
@timothypulliam2177 2 жыл бұрын
Excellent video, perfectly explained. Thank you
@Junker_1
@Junker_1 3 жыл бұрын
Superb explanation. I really love that you also show it visually. It helps me a lot.
@DrTrefor
@DrTrefor 3 жыл бұрын
Glad it helped!
@Trollers233
@Trollers233 2 жыл бұрын
Your Greatest fan from India .
@Tweeteketje
@Tweeteketje 2 жыл бұрын
Extremely well explained!!
@alfutures
@alfutures 4 жыл бұрын
bro awsome video....im studying calc 3 in chinese..you made it super clear. been using your videos to understand in class
@alfutures
@alfutures 4 жыл бұрын
@@DrTrefor they make a new function called l(x,y)=f(x,y)+lamda[g(x,y). and then they find the derivative of l with respect to exerything else....lol..your way is easier
@nathanzbrazil
@nathanzbrazil 3 жыл бұрын
This is *extremely* well-explained!
@indiantechnology7015
@indiantechnology7015 3 жыл бұрын
Thanks very very...........∞ much sir,,,, U cleared my all doubt's about these concepts,,,
@DaveFer
@DaveFer 2 жыл бұрын
Thanks for doing this video. It's great. I'm only sad that I discovered it only after I've already understood it. I've been looking at these Lagrange explanations for years and yours is approximately the best. I love your graphics and your explanation. (Maybe the audio could be a bit better.) If anyone is curious as to a real-life application of this type of solution, think about a consumer that has a budget constraint of, say, $12,000 / year to spend on either food (f) or clothing (c) and the utility U they derive from that food and clothing is given by U = f * c + 1. Their (budget) constraint is the line given by $12000 = (Pf)(f) + (Pc)(c). This method helps us find the combination of food and clothing that maximizes the consumers utility given their budget constraint. Yay! :)
@khalidmuntasir9230
@khalidmuntasir9230 Жыл бұрын
Thank you very much for your excellent lecture.
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