Surface Integrals // Formulas & Applications // Vector Calculus

แชร์
ฝัง
  • เผยแพร่เมื่อ 11 ม.ค. 2025

ความคิดเห็น • 51

  • @rmbennet
    @rmbennet 4 ปีที่แล้ว +55

    Calculus 3 is the highest grade I have gotten since 4th grade. These videos have been lifesaving. Thank you!

    • @DrTrefor
      @DrTrefor  4 ปีที่แล้ว +7

      That's awesome, so glad it helps!

  • @shakennotstired8392
    @shakennotstired8392 4 ปีที่แล้ว +32

    You are a fantastic teacher. Your videos help me to put things in perspective, to better understand what is going on, to better appreciate the theorems, instead of just memorizing formulas. Also, your manner of presentation is very engaging. It grabs one's attention and rouses one's interest, tremendously helpful to students of mathematics. I wish I had a teacher like you when I was young and in college. I am also studying your linear algebra lectures and planning on your discrete math lectures too down the road. God bless you

    • @DrTrefor
      @DrTrefor  4 ปีที่แล้ว +3

      Thank you so much!

  • @user-jm6gp2qc8x
    @user-jm6gp2qc8x 4 ปีที่แล้ว +98

    He's single handedly saving all freshmen

    • @user-jm6gp2qc8x
      @user-jm6gp2qc8x 3 ปีที่แล้ว

      @Hilary Charania don't you dare reply to your comment with another account now

    • @user-jm6gp2qc8x
      @user-jm6gp2qc8x 3 ปีที่แล้ว

      @Gavin Gianni God dammit

    • @vaderanomaly1573
      @vaderanomaly1573 3 ปีที่แล้ว +19

      ayo freshmen? This is calc 3 im dying, and im taking 3B its harder

    • @user-jm6gp2qc8x
      @user-jm6gp2qc8x 3 ปีที่แล้ว

      @@vaderanomaly1573 you can do this. you're stronger.

    • @vaderanomaly1573
      @vaderanomaly1573 3 ปีที่แล้ว +3

      @@user-jm6gp2qc8x its 4am and my finals in 5 hours, i need a really high grade to get a D. Im positive im fucked. But yeah only freshman i know that take calc 3 are ones that took high level calc in hs.

  • @mohan153doshi
    @mohan153doshi ปีที่แล้ว +2

    I wish every university had a teacher like you. Then math would not have been the burden it usually seems to be and sometimes actually is. Your videos light up the world of math.

  • @michaelwilliams6181
    @michaelwilliams6181 4 ปีที่แล้ว +6

    Literally am reading about these topics as you are releasing videos on them. Pretty cool!

    • @DrTrefor
      @DrTrefor  4 ปีที่แล้ว +4

      Thank you!

  • @samb.7395
    @samb.7395 ปีที่แล้ว

    This may be the single most helpful calculus video of all time. I was completely lost with all of these different formulas and when to apply which one. This video is so helpful🤯

  • @highkey4316
    @highkey4316 ปีที่แล้ว +3

    Amazing, amazing video. I had a textbook reading for this and I barely understood it, but this video flipped that switch in my brain and now I feel like I've mastered these! Thank you so much for doing this for us.
    P.S. that temperature function was shockingly good😳20th century average temperature is around 14.0 C!

  • @WasifZahid-g5d
    @WasifZahid-g5d 7 วันที่ผ่านมา

    the method of your teaching is impressive

  • @literallyagalaxy7789
    @literallyagalaxy7789 2 ปีที่แล้ว

    you are a gift for mankind

  • @AlgoJerViA
    @AlgoJerViA 3 ปีที่แล้ว +3

    There is a missing closing parenthesis at 6:45 in the second line. Guess it might be a bit late for a fix, however.

  • @ylap1261
    @ylap1261 3 ปีที่แล้ว +7

    The example of the average temperature of earth made me believe in calculus again.

  • @naveennaidu9064
    @naveennaidu9064 2 ปีที่แล้ว

    Wow, especially at the applications, till that part of video, I've no idea with the creepy function in between them . Thank u so much, it's been 24 hrs I've been searching for that, ur presentation has answered it finally, it's a mass density function.

  • @WasifZahid-g5d
    @WasifZahid-g5d 7 วันที่ผ่านมา

    Sir you are an amazing instructor

  • @ratata3434
    @ratata3434 3 ปีที่แล้ว

    I really loved the part where you ignored what G represents while teaching how to compute but after that you mentioned it, I think that should be the way its done, the way that you do gives the impression of being a universal tool, however had you said like "this G represents mass" some people like me would say "Cool but I really don't care about computing mass."
    Thanks for this amazing video.

  • @sergiolucas38
    @sergiolucas38 3 ปีที่แล้ว +1

    Great video indeed, the temperature example is just amazing :)

  • @먼데이좋은데이
    @먼데이좋은데이 4 ปีที่แล้ว +1

    You saved my grades.

  • @j.o.5957
    @j.o.5957 3 ปีที่แล้ว +5

    This answers my theorizing from earlier, that a "thickness" would have to be calculated in the 4th dimension. Question to self: what would happen if this was the 5th dimension? What would that look like? Well, I'm assuming that since we have a range of temperatures for each position in space, perhaps we'd have another variable that changes with the temperature (like humidity)? Although that would feel like cheating a bit, since it's exactly the same as having another variable vary with the position on the surface. So how do I think about this: we've essentially taken a 2D object that exists in 3D space, given it another variable (such that it's a 3D object) that creates a function G(x,y,z) that lives in 4D. So if we had a 3D object that is bent in 4D, meaning as we traverse the æ variable in the function H(x,y,z,æ), the complete value of the other systems would change. A 4th dimension function G(x,y,z) could be viewed as having a constant æ. So say we have a planet earth, with æ = constant = 2021, the function we have is G(x,y,z) could become the fourth dimensional H(x,y,z,æ), where æ represents a point in time during earth's history (perhaps this would be a sin function, as temperature changes cyclically at earth). Meaning, the 5th dimensional value would take in 4 variables from the 4th-dimensional H(x,y,z,æ) and get the temperature (or any other parameter for that sake) at a given point in time. Which equates well to each temperature point changing depending on some variable. For each point f(x,y) in the plane, there's a height which gives position. For each position G(x,y,z), there's a temperature, which gives temperature at a given position. For each temperature at a given position H(x,y,z,æ), there is a time variable, which gives temperature at a given position at that certain time. Not that instead of time, we could use position in space as the 4th variable, and that using both position in space and time as variables wouldn't work in the 5th dimension. It would however, create a 6th dimension that takes in K(x,y,z,æ,ø), where ø is position in space, meaning that for each temperature at a given position on planet earth at a given time in history, since the variable ø could be different and earth's position in space could be different, we'd have to create multiple universes (where, although the time is the same, the position in space is different). This would in fact happen no matter what variable we add in here, it doesn't have to be position in space. If could be the position of a certain bumblebee. That 6th dimensional function creates another universe (if we use the time, æ, as a variable). So essentially, we have K(x,y,z,æ,ø), which gives us a specific universe in which these conditions are true, that's the 6th dimension. What would the 7th one look like? Before I look into that, it could be useful to evaluate what the fomrulas would look like oh no wait. Nvm, now I see why we created another dimension. So we already have three position variable x, y, z. The moment we create another one ø, we automatically get a new dimension, which again, makes it more trivial. Anyways, it's interesting that we can create a new dimension without creating another universe, by taking in the 3 position variables, as well as time. Actually, instead of time we could take in the variable temperature. use H(x,y,z,G(x,y,z)). So we would get a variable H that, for each time the temperature is a certain way at a position of earth, there is a corresponding H value (such as time). I don't see any other variable that could be used. Oh, but, no, I got an idea. We although we won't be able to accurately pinpoint it, we could use ODE solutions to estimate the chance that something happens. Alright, I'll stop there, I'm writing way too much. But it's just so exciting, can't help it.

  • @barboza7459
    @barboza7459 2 ปีที่แล้ว +2

    wow this was helpfull, thanks mate

  • @sumitkumarsahoo7601
    @sumitkumarsahoo7601 3 ปีที่แล้ว +7

    interesting lecture

  • @ChaineYTXF
    @ChaineYTXF 2 ปีที่แล้ว +1

    this is brilliant.

  • @anjalidabhade2298
    @anjalidabhade2298 4 ปีที่แล้ว +2

    please make a video on vector potential function

  • @Festus2022
    @Festus2022 4 หลายเดือนก่อน

    Nice video. Which video can I find the derivation of the a^2sin-phi---> seen @ about 5.55? Thanks a lot.

  • @ishaanmanhar7392
    @ishaanmanhar7392 2 ปีที่แล้ว

    can we think that normal vector ru cross rv as some kind of jacobian?

  • @j_rryplays8038
    @j_rryplays8038 หลายเดือนก่อน

    shouldn’t the function T have the partial wrt u = 0?

  • @loganm2924
    @loganm2924 3 ปีที่แล้ว +1

    M.V. and vector calc test on Monday... still just making sense of some things 😅

  • @aashsyed1277
    @aashsyed1277 3 ปีที่แล้ว

    what is r sub u is it the partial derivative of r?

  • @persianmeme3530
    @persianmeme3530 3 ปีที่แล้ว

    I heard before before before before till I end up here

  • @geekoutnerd7882
    @geekoutnerd7882 4 ปีที่แล้ว +1

    Very fun!

  • @shabbysing9175
    @shabbysing9175 4 ปีที่แล้ว +1

    Thank you

  • @JonathanLeadingham
    @JonathanLeadingham 2 ปีที่แล้ว

    r u in haken?

  • @Conceptual_Space
    @Conceptual_Space 2 ปีที่แล้ว +1

    nice beard, better than that fkn mic

  • @sarkarsubhadipofficial
    @sarkarsubhadipofficial 3 ปีที่แล้ว +1

    ❤️

  • @gamespotlive3673
    @gamespotlive3673 8 หลายเดือนก่อน

    I'm cooked I think I'm gonna kms

  • @garvitmakkar
    @garvitmakkar 4 ปีที่แล้ว +1

    Your subscribers are decreased i think

  • @wf.i.7260
    @wf.i.7260 8 หลายเดือนก่อน

    Just like the professors, no example solving in real time, going step by step.