MAE5790-2 One dimensional Systems

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  • เผยแพร่เมื่อ 5 ก.พ. 2025

ความคิดเห็น • 102

  • @ShyamDas999
    @ShyamDas999 3 ปีที่แล้ว +27

    Prof. Steven Strogatz's lectures are amazing. I have learned nonlinear dynamics through his lectures. Thanks to Cornell University for documenting these lectures and uploading them on TH-cam.

  • @georgesadler7830
    @georgesadler7830 3 ปีที่แล้ว +4

    DR. Strogatz, thank you for an awesome lecture on Linearization for 1-D systems and Bifurcations analysis of nonlinear systems. These lectures are very entertaining.

  • @AlePreludioFinal
    @AlePreludioFinal 4 ปีที่แล้ว +16

    The perfect complement to the book!

  • @carolinestepanik
    @carolinestepanik 8 ปีที่แล้ว +42

    God Bless these videos!!!

  • @kc-cn8zy
    @kc-cn8zy 6 ปีที่แล้ว +11

    Thank you Prof Strogatz, wonderful series.

  • @redrum41987
    @redrum41987 10 ปีที่แล้ว +9

    It's great I found these videos, they are really going to help with my applied ODE class that is focusing on dynamical systems.

    • @ThePaulTM
      @ThePaulTM 10 ปีที่แล้ว

      RedRum won the Grand National in the UK I think it returned 33 to 1. You will find that waves come from 3 inner cicle diags to one circle, and different waves from 2 inner circle diags. in one circle. They show 5 plus 5 or 10 vector wave arrangements. This is in 3D. This will keep repeating in size and with combo of both. This will keep you going til Xmas.
      Paul

    • @frankdimeglio8216
      @frankdimeglio8216 ปีที่แล้ว

      ​@@ThePaulTM WHY AND HOW GRAVITY AND TWO DIMENSIONAL SPACE ARE CONSISTENT WITH WHAT IS E=MC2:
      E=MC2 is taken directly from F=ma. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! The TRANSLUCENT blue sky is manifest as (or consistent with/as) what is BALANCED BODILY/VISUAL EXPERIENCE. Accordingly, ON BALANCE, the TRANSLUCENT blue sky is true/real QUANTUM GRAVITY !!!! THINK !!! ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution. Importantly, what is GRAVITY is an INTERACTION that cannot be shielded (or blocked) ON BALANCE. Great. You didn't forget to consider what is the orange (AND setting) Sun ON BALANCE, did you !!!!? Magnificent. I have FUNDAMENTALLY and truly revolutionized physics. (Lava is orange, AND it is even blood red.) GREAT !!!! Obviously, carefully and CLEARLY consider what is THE EYE ON BALANCE, as it ALL CLEARLY makes perfect sense ON BALANCE !!! (BALANCE AND completeness go hand in hand.). Fantastic !!! The stars AND PLANETS are POINTS in the night sky. What is E=MC2 IS dimensionally consistent !!! The density of what is THE SUN is then necessarily about ONE QUARTER of that of what is THE EARTH !!! INDEED, notice what is the fully illuminated (AND setting/WHITE) MOON ON BALANCE !!!! What is E=MC2 IS dimensionally consistent !!!! Indeed, TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! CLEAR water comes from what is THE EYE ON BALANCE !!! Excellent. Think.
      By Frank Martin DiMeglio

    • @ThePaulTM
      @ThePaulTM ปีที่แล้ว

      @@frankdimeglio8216 Thank you Frank. The more you study how things go together its only then that you can appreciate the wonderful 3 dimensional order to things.

  • @ahmedamr5265
    @ahmedamr5265 4 ปีที่แล้ว +3

    Thanks a lot! I consider myself lucky to have the chance to learn from your classes :)

  • @ejdansu
    @ejdansu 6 ปีที่แล้ว +15

    Such a great teacher! Thanks Prof!

  • @bengalbasi4753
    @bengalbasi4753 4 ปีที่แล้ว +35

    American professors are real professors.
    The more I try to understand them, I realize atleast I have NOT seen a "professor " in my student life here in India...
    I have read a few excerpts from professor Steven Strogatz's infinite powers. I believe such books should be made known to students here in India who wants to pursue serious science in future.
    Such books by such a top notch professor are a must read for everyone.. Experts, non experts, layperson (like myself ) , students.

    • @frankdimeglio8216
      @frankdimeglio8216 ปีที่แล้ว

      WHY AND HOW GRAVITY AND TWO DIMENSIONAL SPACE ARE CONSISTENT WITH WHAT IS E=MC2:
      E=MC2 is taken directly from F=ma. TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE, AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! The TRANSLUCENT blue sky is manifest as (or consistent with/as) what is BALANCED BODILY/VISUAL EXPERIENCE. Accordingly, ON BALANCE, the TRANSLUCENT blue sky is true/real QUANTUM GRAVITY !!!! THINK !!! ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE). Accordingly, ON BALANCE, the rotation of WHAT IS THE MOON matches the revolution. Importantly, what is GRAVITY is an INTERACTION that cannot be shielded (or blocked) ON BALANCE. Great. You didn't forget to consider what is the orange (AND setting) Sun ON BALANCE, did you !!!!? Magnificent. I have FUNDAMENTALLY and truly revolutionized physics. (Lava is orange, AND it is even blood red.) GREAT !!!! Obviously, carefully and CLEARLY consider what is THE EYE ON BALANCE, as it ALL CLEARLY makes perfect sense ON BALANCE !!! (BALANCE AND completeness go hand in hand.). Fantastic !!! The stars AND PLANETS are POINTS in the night sky. What is E=MC2 IS dimensionally consistent !!! The density of what is THE SUN is then necessarily about ONE QUARTER of that of what is THE EARTH !!! INDEED, notice what is the fully illuminated (AND setting/WHITE) MOON ON BALANCE !!!! What is E=MC2 IS dimensionally consistent !!!! Indeed, TIME is NECESSARILY possible/potential AND actual ON/IN BALANCE; AS ELECTROMAGNETISM/energy is CLEARLY AND NECESSARILY proven to be gravity (ON/IN BALANCE) !!! CLEAR water comes from what is THE EYE ON BALANCE !!! Excellent. Think.
      By Frank Martin DiMeglio

    • @asdfafafdasfasdfs
      @asdfafafdasfasdfs ปีที่แล้ว +8

      One can give praise without being self deprecating... several reasons for this, including that this is a global top professor not virtue of being American vs Indian.

  • @luissoto4525
    @luissoto4525 6 ปีที่แล้ว +2

    The best explanation I have ever seen :O THANKS!!!!

  • @mohamedbadaoui8868
    @mohamedbadaoui8868 2 ปีที่แล้ว

    Thank you Prof. Steven Strogatz's.

  • @martinsaravia
    @martinsaravia 4 ปีที่แล้ว +1

    This is a true gem...

  • @lucakolibius1468
    @lucakolibius1468 4 ปีที่แล้ว +4

    Chapter 3 starts at 32:20

    • @FarhanKhan-ed8ro
      @FarhanKhan-ed8ro 4 ปีที่แล้ว

      can you tell me the book name that prof. use in his lecture

    • @lucakolibius1468
      @lucakolibius1468 4 ปีที่แล้ว

      @@FarhanKhan-ed8ro he authors it and it's called something with dynamical systems. You should be able to Google that easily.

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    The professors showed a lot of forgiveness because they love the truth!

  • @weishanlei8682
    @weishanlei8682 ปีที่แล้ว

    1:14:57 tongue lips. For saddle-node bifurcation, number of fixed points, for r from negative to positive, should be 2 to 1 to 0.

    • @theodoremercutio1600
      @theodoremercutio1600 6 หลายเดือนก่อน

      No, it can go in either direction. It depends whether you're sliding are from positive to negative or vice versa. So both 2, 1, 0 and 0, 1, 2 are correct desceiptions

  • @DaroG35
    @DaroG35 3 ปีที่แล้ว +2

    Based on the great Andronov old book "Theory of Oscillators" One dimensional system dx/dt =f(x) can oscilate if f(x) is real multivalued function eg. when f(x) presents closed loop shape. If f(x) is single valued real function there is no oscilations.

  • @JRush374
    @JRush374 หลายเดือนก่อน

    At 22:00 that left unstable point would only exist in a pure mathematical sense. But in the real world it wouldn't because if you have 0 bacteria the number of bacteria wouldn't increase. X>=1

  • @hanumanbearpig
    @hanumanbearpig 4 ปีที่แล้ว

    Great videos!

  • @yifuxero5408
    @yifuxero5408 ปีที่แล้ว

    .
    The four simplest cases are:: 1. x^2 - 2, seed 2*cos(k*Pi/N), N is odd,
    2.. (x^2 - 1) / (2*x), seed cot(k*Pi/N), and the iterative logistic
    map 4*x*(1-x), with seed sin^2(k*Pi/N). For any given N, say 7, the
    results are the same as to the periods. Results for the first few N:
    (3, 5, 7, 9, 11, 13, and 15) are respectively (1, 2, 3, 3, 5,
    6, and 4). Feel free to try it with N = 7. You'll get period 3 for
    each.

  • @shuangmiao2929
    @shuangmiao2929 4 ปีที่แล้ว +1

    24:44 You didn't talk about the initial condition, so the uniqueness doesn't even make sense here.

  • @lemons107
    @lemons107 2 ปีที่แล้ว

    Brilliant

  • @pettPette
    @pettPette 8 ปีที่แล้ว +1

    I enjoyed this.

  • @benmyers4279
    @benmyers4279 3 ปีที่แล้ว +2

    Impossibility of oscillation only works if f(x) is real. If we have an equation dx/dt = ix, then we get x(t)=exp(it)

    • @zeldovich33
      @zeldovich33 3 ปีที่แล้ว +2

      He defines in the first class that the treatmens on one dimensional flows are for f(x) thar are real

  • @Odysseusf
    @Odysseusf 4 ปีที่แล้ว

    Fantastic!

    • @Odysseusf
      @Odysseusf 4 ปีที่แล้ว

      bookmark:33:36

  • @srikanthgopalan1593
    @srikanthgopalan1593 7 ปีที่แล้ว +1

    Is there a typo in the book? It specifies the first bifurcation example discussed as xdot = r - x^2 and then the discussion about fixed points for r >0, r = 0, and r < 0 don't follow in the book. In the lecture here since xdot = r + x^2, it makes sense.

  • @handledav
    @handledav 4 หลายเดือนก่อน +1

    wow

  • @zphuo
    @zphuo 5 ปีที่แล้ว +1

    @1:08:30 why r

  • @PymGordonArthur
    @PymGordonArthur 4 ปีที่แล้ว

    Thank you very much.

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    So blank is really small and from here we'd like to neglect the blank term!

  • @advancedappliedandpuremath
    @advancedappliedandpuremath 10 หลายเดือนก่อน

    Hi Sir hope you are having great time. I have a question regarding fixed point. In context of a function fixed point is defined as f(x) = x or standard notion is T(x)=x as given by Banach fixed point theorem. But in context of dynamical system when we use the word fixed point it seems that it doesn't relate to definition T(x) = x but rather we say that fixed point is where the derivative is zero. So my question is that does the word fixed point meaning differs in both contexts or is there any analogy.

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    Why does u of m love differential equations so much?

  • @LenBerman
    @LenBerman 4 ปีที่แล้ว

    What are possible sets of fixed points in 1D as f varies. Awaiting book.

  • @brendawilliams8062
    @brendawilliams8062 3 ปีที่แล้ว

    Thankyou

  • @michaellewis7861
    @michaellewis7861 4 ปีที่แล้ว

    Aren’t you continually assuming a specific time relation between either the evolution of x with time or x dot with time when making the graph?

  • @siaahmadi413
    @siaahmadi413 4 ปีที่แล้ว

    10:47 but what if the derivative of f is on the order of eta while its second derivative is on the order of sqrt(eta)?

    • @derekxiaoEvanescentBliss
      @derekxiaoEvanescentBliss 4 ปีที่แล้ว

      Eta is your small variation around a fixed point (or really any chosen point). If, for a chosen maximum eta, your f'' turns out to be roughly f'/eta*2, such that f''*eta^2/2 ~ f'*eta, ie the if it turns out that FOR A GIVEN ASSUMED MAXIMUM ETA (for example eta

  • @aneet84
    @aneet84 8 ปีที่แล้ว

    Hmmm... I wonder what chalk he uses on his chalk-board. Hagoromo? Didn't look like it. I would very much like to know!!

  • @mohmtl
    @mohmtl 4 ปีที่แล้ว

    Hi
    I would appreciate the help of someone who took the course or has the material to provide me with the assignments or problem sets in this course which are typically chosen from the textbook just problem numbers from the textbook for each assignment.
    Kind regards

  • @DanGM123
    @DanGM123 5 ปีที่แล้ว

    strogatz is da man

  • @zeynepadguzel2131
    @zeynepadguzel2131 3 ปีที่แล้ว

    sorry.how to draw rx-e^x diagram.can you help me

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    Harmonic oscillator is a truncated Taylor series

  • @hanyerfan8204
    @hanyerfan8204 6 ปีที่แล้ว

    really gud :)

  • @solonsaoulis5290
    @solonsaoulis5290 7 ปีที่แล้ว

    Looks like the sound is blocked...

  • @mohitoness
    @mohitoness 9 ปีที่แล้ว

    how does this "exchange of flavors" look in 3d??

  • @xaviervangorp4862
    @xaviervangorp4862 4 ปีที่แล้ว +3

    27:50 : Solution by the method of perfect drawing cause I'm a god

  • @mabdinur85
    @mabdinur85 6 ปีที่แล้ว

    Maybe better to call them a trident instead of a pitchfork?

  • @wiemabichou5840
    @wiemabichou5840 7 ปีที่แล้ว

    Someone knows where I find the course notes, please???

    • @yiwensin5913
      @yiwensin5913 7 ปีที่แล้ว +1

      Nonlinear dynamics and Chaos - Steven Strogatz (his own book). He mentions it in the first lecture.

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    Obama did look at the data and I got into rank 1 under Obama because I have good genetics!

  • @iconjack
    @iconjack 7 ปีที่แล้ว +1

    At 11:05, η² might be small, but how do we know f''(x*) is not huge enough to make the product significant?

    • @yiwensin5913
      @yiwensin5913 7 ปีที่แล้ว

      Then just choose η to be small enough so that the f' term is negligible.

    • @shirou9790
      @shirou9790 7 ปีที่แล้ว +7

      Well, since f''(x*) is a constant whatever the value of η, we do have that f''(x*).η² converges towards 0 faster than f'(x*).η as η→0.

  • @tolaneco
    @tolaneco 5 ปีที่แล้ว +1

    Room for improvement in camerawork.

  • @marshallmykietyshyn4973
    @marshallmykietyshyn4973 3 ปีที่แล้ว

    I'm sorry, physicists are "cavalier" about mathematical rigour? As an engineer, I object.

    • @Hexanitrobenzene
      @Hexanitrobenzene 3 ปีที่แล้ว

      It probably depends on the particular field of physics. Applied fields tend not to worry, because real world measured quantities most of the time are described by well behaved analytical functions. Theoretical fields most probably do, otherwise one could get paradoxes in theories.

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    Christine aikens bra ket book was super confusing

  • @Harmonyano
    @Harmonyano 2 ปีที่แล้ว

    mark 22:13

  • @awsumpersun321
    @awsumpersun321 6 ปีที่แล้ว

    x' = x + dirac(x-2)
    first order ODE that is periodic?

  • @teclishighelf5787
    @teclishighelf5787 6 ปีที่แล้ว +1

    @17:53 is "honest to god" a technical math term? Could you please demonstrate a dishonest to god unstable fixed point in order to clarify the difference? Could you demonstrate an honest to Satan fixed point?

    • @tumadre259
      @tumadre259 6 ปีที่แล้ว +7

      don't cut yourself with that edge

    • @Mahmood42978
      @Mahmood42978 6 ปีที่แล้ว +1

      @@tumadre259 I sense Teclis High Elf wears a fedora and identifies as an "Incel"

  • @JamesVestal-dz5qm
    @JamesVestal-dz5qm ปีที่แล้ว

    This class sucks thermo is way trippier

  • @ThePaulTM
    @ThePaulTM 10 ปีที่แล้ว +1

    I show that 3d geometric DNA and Wave strings are generated from the very start of creation in helical form In super perfect order. This can explain the non-linear Lorenz Effect in which mathematicians decide that everything is Chaos. Please say If I am wrong & explain how our nose goes between our eyes from Cornell to the butterflies in Hong KONG?

    • @fgeng3828
      @fgeng3828 8 ปีที่แล้ว +1

      I don't really see the point in attacking the chaos theory to establish a 3D order. The existence of chaos doesn't immediately prescribe it as the dominant form. The visualisation tool adopted by Poincare is just as effective in analysis of either chaos or order. And the notion of stability is certain an essential cornerstone for any order,be it 2d or 3D.

    • @ThePaulTM
      @ThePaulTM 8 ปีที่แล้ว

      I am not really attacking the chaos theory because it is just a load of baloney. There is a perfect PLATONIC ORDER for DNA that you find difficult to accept. There is no mention of a system of order called CubicWonder you only focus on your fractal systems of disorder. The Lorenz effect started your theory of chaos but I have shown I can produce a similar effect with 3d geometric order. If 100,000 cars jam up the city centre it can be called chaos but later in the evening the chaos is gone.
      I think you ignore the discoveries that I have made of a perfect 3D order because you as scholars missed out.
      You keep hyping up chaos and pretend the 3D order I show does not exist. So then if chaos is so, can it start small like a little shape. What colour is it and how much does it weigh ?

    • @fgeng3828
      @fgeng3828 8 ปีที่แล้ว

      Can you please provide a phase space of CubicWonder for possible analysis?

    • @ThePaulTM
      @ThePaulTM 8 ปีที่แล้ว

      I show how it goes together on my videos. When you say you want a phase space. This system provides all the waves to infinity such as DNA, sound or electricity. I have shown for years how 3 phase electrical helical waves come from a string of cubes in 3D they are not flat like in a book. You will have to decide what you want to study. CubicWonder is a part of the Platonic system of order. Study my videos and you can decide exactly what to work on.

    • @fgeng3828
      @fgeng3828 8 ปีที่แล้ว

      The reason I ask for a phase space is it helps to visualize the trajectory of the system. I understand you have your own formalism but you need to boil that down to a set of differential equations (or some generalised form) that specify your system in a phase space, otherwise we can't apply traditional approach to analyse it. About myself,, I'm currently studying my bachelor degree in Molecular Biology.

  • @ThePaulTM
    @ThePaulTM 10 ปีที่แล้ว

    Are the questions that I asked being analized to give me an answer? They are perfect 3D reality in 3D geometry. I was hoping you could have said something because Plato said everything comes out of geometry. This 3d geometry gives us 3 types of DNA & proves non-linear stuff not being chaos. These discoveries should at least be given some sort of answer from Cornell. Unless you are all sure about the chaos with no use for this Plato 3D fractal order & DNA geometry that comes from a system of order called CubicWonder.
    Paul

    • @ThePaulTM
      @ThePaulTM 10 ปีที่แล้ว

      It would be nice if the scholars of Cornell can come up with an answer to my questions about the perfect order I show that is not chaos. Why are you looking down your noses at these major discoveries that show DNA 3D geometry is concentrical around the 10_20 vectors for a perfect system using Plato 3D geometric order. These new finds are practical and logical in 3D reality. Why is it so much trouble for your brillient mathematicians to come up with an answer to admit that your theories about a system of chaos is nothing but load of nonsense?
      Hope to hear from Cornell in 2015.
      Paul

    • @ThePaulTM
      @ThePaulTM 10 ปีที่แล้ว

      It is better if I talk to a wall, Stay with your chaos and keep selling to people who do not understand 3D. You know it will run out of steam or they could ask for their money back.

    • @mohitoness
      @mohitoness 9 ปีที่แล้ว

      ThePaulTM of course it is of a perfect and higher order, because math is limited by our way of interacting with our sense data and the world, and is only there to be able to explain it in a very particular way. But its limitations are also its strengths; isn't that what makes us human?

    • @ThePaulTM
      @ThePaulTM 9 ปีที่แล้ว

      Thank you,
      We are looking at a wonderful system of 3D geometric order that is impossible to imagine by just using equations. We are just begining to scratch the surface of this 3 dimensional system that is of super perfection & was taught by Plato. Up until now academics do not show enough order for a little finger. Why would they keep pushing 2D chaos and have no interest in 3D order ?

    • @danlurny4129
      @danlurny4129 9 ปีที่แล้ว

      +ThePaulTM Maybe there are some geometrical restrictions in the processs of DNA formation, so we need to include this restrictions to add to the equations to solve more complicated problems< which are biological problems. But mathematical way itself is rigorous and we trust it. I don't see contradictions. To solve problem we need to know what is a region in which we solve our problem. But we don't know a lot. Science оust keeps going and try out different methods. Century ago we didn't know about many things. Don't accuse anyone. Iluminati NOT exists)