Stieltjes Integral

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  • Опубликовано: 23 дек 2024

Комментарии • 206

  • @drpeyam
    @drpeyam  6 лет назад +94

    Note: At 4:10 that’s supposed to be the integral of x d(x^2), not dx. I am NOT calculating the integral of x dx, that’s why the answer is 2/3, not 1/2.

    • @drpeyam
      @drpeyam  6 лет назад +8

      Omer Lublin Wow, that’s a great way of putting it!!!

    • @quickmath8290
      @quickmath8290 6 лет назад

      Ah now I see it ... I am so sorry 😐

    • @willyou2199
      @willyou2199 6 лет назад +1

      xd(x^2) = x*2xdx = 2x^2dx = 2/3 x^3
      What's the difference?
      This is like Riemann integrals but u-subbed.

    • @drpeyam
      @drpeyam  6 лет назад +12

      Will You No difference for smooth alpha, but the approach I gave works as well for alpha that is not differentiable

    • @manimaran968
      @manimaran968 5 лет назад

      @@drpeyam Thank you...

  • @johnteran8889
    @johnteran8889 Год назад +3

    I saw this Dr Peyem video in my search for "reimann stieltjes integrals" and immediately understood it would be exactly the video i was searching for.

    • @azzteke
      @azzteke 8 месяцев назад

      What does "reimann" mean?

  • @scruffysean3640
    @scruffysean3640 4 года назад +22

    Dr. Peyam, you have a wonderful style. I wish more professors could have just a little of your enthusiasm. Glad I stumbled across your Stieltjes integral lecture!

  • @brunomartinez5002
    @brunomartinez5002 6 лет назад +6

    Your videos just keep becoming more interesting... this last month or so has been crazy! Keep up with your work!

  • @MrCigarro50
    @MrCigarro50 6 лет назад +7

    Thank you very much. For us, statisticians, this video is very important. We know you go to great lengths to produce this videos and we appreciate it.

  • @yakov9ify
    @yakov9ify 4 года назад +5

    We actually learned this integral instead of a reimann integral in my analysis class, quite challenging but very satisfying when you actually understand it.

  • @tylerwu601
    @tylerwu601 6 лет назад +14

    I really wanna see an introduction to contour integration. Complex analysis is always so much fun to me.

  • @weltkaiserendzeit2417
    @weltkaiserendzeit2417 5 лет назад +21

    is it me or is this guy very VERY happy to introduce us this integral ?

  • @thisismycoolnickname
    @thisismycoolnickname 6 лет назад +10

    Interesting. I've always done this trick called "put smth under the differential". And it has always made perfect sense because it's the same as applying the chain rule backwards. And now I am surprised that there is some additional definition to this integral.

  • @ilyboc
    @ilyboc 4 года назад +5

    if only my teachers sound happy like you do :-)

  • @mariaguthier1066
    @mariaguthier1066 6 лет назад +5

    I love how math excites you, great video! Please keep with the great work!

  • @gigispence6011
    @gigispence6011 4 года назад

    Your enthusiasm made me really happy to study RS integrals

  • @vangrails
    @vangrails 5 лет назад +12

    The German word Matjes comes from the Dutch word maatjes and means small hearings. Via adding the suffix "je" you can make a diminutive of a word in Dutch and the last s makes it a plural. But "Stieltjes" is a strange word/name even for Dutch people. The Dutch word stiel means craft but it is strange to make a diminutive of that.

    • @drpeyam
      @drpeyam  5 лет назад +1

      This is awesome, thank you!

    • @azzteke
      @azzteke 8 месяцев назад

      What is "hearings"? Nonsense!

  • @riccardoagazzi1258
    @riccardoagazzi1258 6 лет назад +55

    Use the CHEN-LUUUH!!!

    • @koenth2359
      @koenth2359 6 лет назад +3

      Riky Agazzi yeah great. It's from black pen red pen ISN'T IT?!

    • @blackpenredpen
      @blackpenredpen 6 лет назад +6

      No, Dr. P started it! He's the original!

    • @koenth2359
      @koenth2359 6 лет назад +2

      blackpenredpen ok good to know, thanks!

    • @drpeyam
      @drpeyam  6 лет назад +5

      blackpenredpen Technically Xuemin Tu started it 😂😂😂😂

    • @blackpenredpen
      @blackpenredpen 6 лет назад +2

      Dr. Peyam's Show ahhhh yes!!!!

  • @spencertaylor6910
    @spencertaylor6910 6 лет назад +4

    Awesome job. The Stieltjes integral hits the dab

  • @partisano75
    @partisano75 6 лет назад +1

    thanks for post it, dear Dr Peyam, for some students is unknown, today i've learned from you... greetings for you.

  • @hamsterdam1942
    @hamsterdam1942 5 лет назад +22

    integral x d(x^2) = integral sqrt(x^2) d(x^2) = integral sqrt(t) dt = t^1.5*2/3 + C = x^3*2/3+C
    So answer is 2/3

    • @francescocostanzo8225
      @francescocostanzo8225 6 месяцев назад

      Does this substitution work due to us being in the positive domain? Or would we be able to get complex solutions?

  • @EL-eo8dh
    @EL-eo8dh 6 лет назад +14

    It will be nice if you would like to have a talk on stochastic integral!

  • @martinsanchez-hw4fi
    @martinsanchez-hw4fi 4 года назад +2

    I have yet the doubt about the procedure in 9:06 in treating de differentials like numbers or fractions. I know the chain rule, though

  • @lebesgue-integral
    @lebesgue-integral 9 месяцев назад

    I love your videos! I saw this in an undergraduate-course-level Introduction to Measure Theory. Hardest course I've taken as an undergrad, and I remember the professor calculating this integral, as well as Lebesgue integrals, in the midst of Statistics and Probability. It was hard to get approved for this one! I will check your "Lebesgue Integral Overview" video.

    • @drpeyam
      @drpeyam  9 месяцев назад

      Thank you!!

  • @shiina_mahiru_9067
    @shiina_mahiru_9067 6 лет назад +23

    Well, the name of the integral seems weird at first, but it turns out that, it reminds me the way my teacher taught me to avoid using u-sub. For example, let's say integral (ln x / x dx). Instead of u-sub, my teacher taught me to turn it into integral (ln x d(ln x)) = (ln x)^2/2. I really did not think there is a proper (and awkward) name for such an integral!

    • @guilhermeguimaraes1858
      @guilhermeguimaraes1858 6 лет назад +1

      How did u do that ? How do u change dx to d(ln x) can u please explain me ?

    • @shiina_mahiru_9067
      @shiina_mahiru_9067 6 лет назад +2

      d(ln x)/dx = 1/x, so d(ln x) = 1/x dx. That's how my teacher taught me.

    • @guilhermeguimaraes1858
      @guilhermeguimaraes1858 6 лет назад +2

      WOw dude ! TYVM ! This is amazing, can be quite helpful with some trick Riemann Integral !...

    • @badrunna-im
      @badrunna-im 6 лет назад +7

      Guilherme Guimarães not really. The premise is still the same as substitution, just less explicit. By letting u=ln x, you're trying to integrate with respect to d(u) (normal substitution) = d(ln x) (the above technique).

    • @skylardeslypere9909
      @skylardeslypere9909 3 года назад

      My teacher did the same thing. But, by then I already knew substitution because of youtube videos so I never liked that method

  • @hishan.farfan
    @hishan.farfan 6 лет назад +9

    Excellent video as always! could you make one about stochastic calculation please?

  • @AndDiracisHisProphet
    @AndDiracisHisProphet 6 лет назад +38

    The question is: How many of your viewers know what Matjes are?

    • @drpeyam
      @drpeyam  6 лет назад +7

      Hahahaha, I was hoping someone would get the reference 😂😂😂😂

    • @AndDiracisHisProphet
      @AndDiracisHisProphet 6 лет назад +8

      Well you have quite some german viewers, so q few would, I think^^

    • @blackpenredpen
      @blackpenredpen 6 лет назад +8

      i dont...

    • @AndDiracisHisProphet
      @AndDiracisHisProphet 6 лет назад +4

      You are good at math, but your german could use some polish^^

    • @AndDiracisHisProphet
      @AndDiracisHisProphet 6 лет назад +2

      dahlhoff.de/wp-content/uploads/167_edlesmatjesfiletinoel.png

  • @sidharathsharma6197
    @sidharathsharma6197 5 лет назад +1

    I feel lucky to come across your videos on youtube!

  • @bballfanmobile2544
    @bballfanmobile2544 5 лет назад +14

    I love saying “Stieltjes” too! 😂

  • @vpambs1pt
    @vpambs1pt 6 лет назад +1

    What's the purpose of this integral? The result is different from the riemman integral, what does that 2/3 mean?

  • @ralfbodemann1542
    @ralfbodemann1542 6 лет назад +2

    Awesome video, thanks! Your performance is much better when you don't use any notes.

  • @johan.de.matan.
    @johan.de.matan. 4 года назад +1

    Haven't got what's difference between this nicely-named integral and making simple substitution. I was tought that some intergrals can be much easier solved by making impicit substitution kind of:
    f(u(x))u'(x)dx = f(u(x))d(u(x))
    We named it "put under differential"
    Have using this for a long time without any think that it has its own name, and moreover, is more generilized then Riemann intergal

  • @adityaekbote8498
    @adityaekbote8498 3 года назад

    So cool both the video and the integral hehe
    Other videos never give me this kind of intuition as much as your videos give Dr.P
    And now that I have made it a ritual: noice

  • @elgazeta
    @elgazeta 3 года назад

    Dr. Peyam you and math are amazing

  • @Alexander-pk1tu
    @Alexander-pk1tu 2 года назад

    Thank you very much! You are very talented at transferring knowledge.

  • @Ritsu-qz3pe
    @Ritsu-qz3pe 4 года назад +1

    How delightful lecture it is

  • @車虎次郎-y5c
    @車虎次郎-y5c 2 месяца назад

    Wow! fantastic! It's very good examples to understand this integral calculate.

    • @drpeyam
      @drpeyam  2 месяца назад

      Thank you!! 😊

  • @lalitsharma8986
    @lalitsharma8986 Год назад

    Like integration means the area under the curve what does riemann stieljes integral means physically

  • @NAMEhzj
    @NAMEhzj 6 лет назад +1

    Hey Dr. Peyam, great video as usual! But i was wondering why you said the Stieltjes Integral was less general than the Lebesgue Integral. In our lecture we defined the lebesgue integral via first defnining a Lebesgue pre-measure, then extending that to the Lebesgue-measure and then defning an Integral by any measure. We also defnied a "Stieltjes-pre-measure", so i would imagine if you would extend that to a measure in the same way you could define the Stieltjes-integral with that and you would have something thats definitely more general, because the Lebesgue-measure is just the special case alpha = x. Or is that going to lead to problems in some of the nice proofs?

    • @drpeyam
      @drpeyam  6 лет назад +2

      Since a Stieltjes pre-measure is a special kind of pre-measure, the Lebesgue integral is more general, since it works for any kind of pre-measure, not just the Stieltjes one! Also by Stieltjes Integral I’m referring to the one in this video, where I’m presenting it the Riemann way (it’s sometimes called the Riemann-Stieltjes integral)

    • @NAMEhzj
      @NAMEhzj 6 лет назад

      Ah that makes sense. Thanks :)

  • @DylanD-v9g
    @DylanD-v9g Год назад

    Thanks for the video. What is the difference between the Stieltjes integral and the Riemann-Stieltjes Integral?

  • @irvinep
    @irvinep 8 месяцев назад

    can you please make me understand what do you mean by "taking x and stretching out with x^2". I am trying to understand the picture of this integral

  • @link_z
    @link_z 6 лет назад +9

    Thanks for this video. I understand how this kind of integral works but I fail to understand how it could be useful.

    • @drpeyam
      @drpeyam  6 лет назад +8

      It’s very useful in statistics, but I don’t think it’s used much in math, since the Lebesgue integral is much better! But still, a nice generalization of the Riemann integral

    • @link_z
      @link_z 6 лет назад +2

      Thanks for your fast answer Mr. πm :) Understood!

    • @povijarrro
      @povijarrro 6 лет назад

      Dr. Peyam's Show And Lebesgue-Stieljes integral (instead of (b-a) as the measure of interval (a,b) take (alpha(b)-alpha(a))) is the best

    • @MrCigarro50
      @MrCigarro50 6 лет назад +6

      In Statistics we use it for ignoring the difference between continuous and discrete random variables. It allows us to express in a close simple form distribution functions and functions of distribution functions (namely Expected values, variances,...etc) that otherwise would be cumbersome.
      Lebesgue Integral is far more beautiful, elegant,...but things there get far more complicated. You can see Doctor Peyam´s videos about that. He has done a great job for us.

    • @blackmagicsuiteopus9545
      @blackmagicsuiteopus9545 4 года назад +2

      Hi, im 2 years late. I've just discovered this integral when studying QM. It is used in the spectral decomposition of general self-adjoint operators, the measure being an orthogonal projector, function of the eigenvalue of the operator.

  • @thomaskim5394
    @thomaskim5394 3 года назад

    Where did you get the square for i instead of just i? Also how did one become i?

  • @rizkyagungshahputra215
    @rizkyagungshahputra215 6 лет назад +1

    11:06 I think the upper bound should be 0(LHS)

    • @drpeyam
      @drpeyam  6 лет назад

      It is, though, no?

  • @Gamma_Digamma
    @Gamma_Digamma 4 года назад +2

    Now I get it...
    The name was Rumple stieltjes skin

  • @camrouxbg
    @camrouxbg 3 года назад

    What is the motivation for doing this type of integration?

  • @leif1075
    @leif1075 4 года назад

    Why do you multiply i/n times the squared terms?

  • @Rawan-rq4rg
    @Rawan-rq4rg 2 года назад

    Mr Peyam First I want to thank you because this video has helped me very much
    I want you to talk about Hadamard integral next time

  • @LS-Moto
    @LS-Moto 6 лет назад +6

    Du bist der BESTE 😀

    • @drpeyam
      @drpeyam  6 лет назад +1

      Danke!!! :D

    • @quickmath8290
      @quickmath8290 6 лет назад +1

      Ah noch ein deutscher der Mathe süchtig ist 😂

    • @nullplan01
      @nullplan01 6 лет назад

      How do you know he's German? Because he speaks the language? Because then I'm a processor!

    • @LS-Moto
      @LS-Moto 6 лет назад

      nullplan01 Who claimed that he is German? I don't see anyone? To my knowledge, I believe to have heard he was born in Austria and was educated in a French school. What citizenship he holds is unknown and irrelevant to me. I'm just asking if he would feel like making some Math Videos of this kind in German because: 1. there aren't a lot of good German math channels and 2. His German is very good and I'm sure it could be fun.

  • @reminasashes6930
    @reminasashes6930 6 лет назад +1

    Would a substitution also work? For example, integral of x d(x^2) from 0 to 1. We set y=x^2, so x=y^1/2. That means we have the integral of y^1/2 dy, from 0^1/2 wich is 0, to 1^1/2 wich is also 1. Integrated that would be (2/3)y^3/2 evaluated from 0 to 1, wich would also be 2/3. Am i right, or is it a coincidence?

    • @drpeyam
      @drpeyam  6 лет назад

      Yep, if alpha is smooth, then it’s substitution, but this method also works if alpha is not differentiable!

  • @lalitsharma8986
    @lalitsharma8986 Год назад

    What does this amount of integration means physii

  • @zahirjan9935
    @zahirjan9935 5 лет назад +1

    Sooooooooo ... ooo ... thanks dear teacher! I got everything! !!

  • @thedarkspeedninjashadittsux
    @thedarkspeedninjashadittsux 6 лет назад +1

    So could you do int xda(x), where a(x) = e^x?

  • @jesusalej1
    @jesusalej1 4 года назад +1

    Absolut capo! Total genius...

  • @sundayolabisiodeleye9071
    @sundayolabisiodeleye9071 6 лет назад +1

    Is Stieltjes and Reimann Stieltjes integral the same?

  • @SupriyoChowdhury5201
    @SupriyoChowdhury5201 Год назад

    Sir does alpha(x) need be a continous monotone function for it to work?

    • @drpeyam
      @drpeyam  Год назад

      Not continuous, I think right continuity is enough

  • @harisimer
    @harisimer 6 лет назад +1

    Aber das ist doch garnicht gleich dem Riemann - Integral oder wie muss ich das sehen? int_0^1 x dx = 1/2. Riemann and Lebesque calculate for the area under the curve 1/2, which area is given by Stieltjes with 2/3?

    • @drpeyam
      @drpeyam  6 лет назад

      Tut mir Leid, aber in diesem Video rechne ich die Integrale von x d(x^2), nicht x dx, darum ist die Antwort 2/3, nicht 1/2

    • @harisimer
      @harisimer 6 лет назад

      but what area describes that? or isnt there a visualization?

    • @drpeyam
      @drpeyam  6 лет назад +1

      It’s the area under x, but where your axis becomes x^2, so think like bending your axis to become x^2.

    • @dlevi67
      @dlevi67 6 лет назад +1

      If I understand what is happening correctly, more than bending this is stretching (or "modulating" - given alpha could be anything, not just a monotonic function!) the x axis itself.
      [This is almost (again if I understand this correctly) like a double integral, except that rather than integrating the same function twice with respect to two variables we integrate once with respect to two "simultaneous" functions in the same variable. But I may have misunderstood the concept completely!]

    • @armandobuzzini9171
      @armandobuzzini9171 6 лет назад

      el diferencial de la integral no es dx, sino el diferencial de una funcion. en este caso una parabola

  • @michelkhoury1470
    @michelkhoury1470 5 лет назад +1

    Doctor, I remark that Riemann integral is a particular case of Lebesgue integral. Am I right?

    • @drpeyam
      @drpeyam  5 лет назад +2

      More or less, at least for a finite closed interval [a,b]

    • @drpeyam
      @drpeyam  5 лет назад +2

      There’s a video on Riemann vs Lebesgue Integral actually!

    • @michelkhoury1470
      @michelkhoury1470 5 лет назад

      Okay thank you doctor Peyam :)

  • @amanmahendroo1784
    @amanmahendroo1784 6 лет назад +1

    could you please do a tutorial on the inverse Laplace transform?

    • @drpeyam
      @drpeyam  6 лет назад +1

      Flammable Maths Sounds like a job for you :)

    • @amanmahendroo1784
      @amanmahendroo1784 6 лет назад

      Dr. Peyam's Show thanks! amazing content though👍

  • @quickmath8290
    @quickmath8290 6 лет назад +1

    Have a question : what is this useful for because normaly the answer to this integral with dx is 1/2 but you got 2/3 so how could you solve some integral with this technique to get the normal dx answer ? I feel kind of uncomfortable with this

    • @drpeyam
      @drpeyam  6 лет назад +2

      It’s not very useful in math, but apparently more useful in statistics. I don’t think you can use Stieltjes integrals with alpha to solve integrals with dx.

    • @quickmath8290
      @quickmath8290 6 лет назад +1

      Dr. Peyam's Show thanks I feel better now 😂 but it's nice to do some math for fun

  • @sundayolabisiodeleye9071
    @sundayolabisiodeleye9071 6 лет назад +1

    Sir! Kindly help me find the value of ∫(x^5 d(x^2 ) where x is from -2 t0 3

    • @drpeyam
      @drpeyam  6 лет назад

      Integral from -2 to 3 of x^5 times 2x dx where

    • @hausinchiu5525
      @hausinchiu5525 5 лет назад

      Convert x^5 into (x^2)^(2.5) so the integral will be in the form t^2.5 dt , use the power rule backwards

  • @hheg2727
    @hheg2727 6 лет назад

    In general you can use integration by parts and get:
    Integral from 0 to 1 of x da(x)
    = a(1) - Integral from 0 to 1 of a(x) dx

  • @Sanntik
    @Sanntik 6 лет назад +2

    I kind of prefer the blackboard, black shirt and the chalk all over it haha! anyway, still awesome :D

  • @권땡아
    @권땡아 3 года назад

    thank you so much😭 from Korea

  • @justwest
    @justwest 6 лет назад +6

    Very nice! A geometric interpretation would have been very nice, or why we would want alpha to be something else other than just x. You mentioned statistics and blah, maybe it's just not so easy to give easier, practical examples.

    • @drpeyam
      @drpeyam  6 лет назад +4

      Yeah, I can’t really think of a more practical application, since mathematicians mainly use the Lebesgue integral anyway. But I’m guessing that if you want your integral to emphasize the point 0 more, you’d use alpha(x) = x^2 instead of x, but I agree, it’s more of a statistical thing

    • @hheg2727
      @hheg2727 6 лет назад +3

      Sometimes it can be a nice way to write substitutions. For example in spherical coordinates you integrate over sin(theta) dtheta or even nicer dcos(theta)

    • @MrR3KK
      @MrR3KK 5 лет назад

      I found this in a text about creep law for uniaxial stress in viscoelastic materials.

  • @qiguosun129
    @qiguosun129 Год назад

    anyone want to know applications can refer controlled different equations.

  • @rubus92202
    @rubus92202 4 года назад

    Should alpha(x) at least monotone ?

    • @drpeyam
      @drpeyam  4 года назад +2

      Yeah something like that, and left continuous

  • @Sad-mm8tm
    @Sad-mm8tm 2 года назад

    love your energy

  • @camilosuarez9724
    @camilosuarez9724 4 года назад +1

    Super!!!! Thanks a lot, I really enjoyed it !!!!

  • @edificioalsacis7648
    @edificioalsacis7648 5 лет назад +2

    i love yur hapiness

  • @lunjapaobaite4071
    @lunjapaobaite4071 5 лет назад

    Dr.payem... Sir can u make a video on malmsten's integral

    • @drpeyam
      @drpeyam  5 лет назад +1

      Vardi Integral ruclips.net/video/W2QFhyC_BQ8/видео.html

  • @sandmann6851
    @sandmann6851 6 лет назад +1

    I don't get 7:37. Why "2N³"?

    • @yoavshati
      @yoavshati 6 лет назад

      When N approaches infinity, N(N+1)(2N+1) approaches 2N^3

  • @shahzodadavlatova7203
    @shahzodadavlatova7203 3 года назад

    This was so very helpful, thank you!

  • @stydras3380
    @stydras3380 6 лет назад +3

    That is A W E S O M E :)

  • @user-ph2jf4ji1j
    @user-ph2jf4ji1j 3 года назад

    You are one awesome person.

  • @yuvalpaz3752
    @yuvalpaz3752 6 лет назад +1

    Great video! But, in 9:40 you said smooth, ain't it enough for alpha to be Differentiable? or it has to be smooth?
    also in the last example alpha is called RELU(rectified linear unit).
    Maybe you should do a follow up video and do integration by parts for Stieltjes Integral :).
    P.S. Do you know any good pure math books(for third year of uni or so)? preferably something with differential equations

    • @drpeyam
      @drpeyam  6 лет назад +2

      Once differentiable is enough! I use smooth in a broad sense, as in “take as many derivatives as you need” (which may be 1 or infinity :P).
      Good idea, but I think that might just follow from the product rule (for once differentiable alpha).
      Oh, and I highly recommend the 4 books by Stein and Shakarchi, they’re a great introduction to post real analysis topics. And I also like the differential equation book by Hirsch/Smale/Devaney, and the PDE book by Evans

    • @yuvalpaz3752
      @yuvalpaz3752 6 лет назад

      The books are "Princeton Lectures in Analysis" series and "differential equation dynamical systems and an introduction to chaos"? I failed to find the last one.
      I'll look into them thanks very much, I'll probably start with the third book of "Princeton Lectures in Analysis"

    • @drpeyam
      @drpeyam  6 лет назад

      Partial differential equations by Lawrence C Evans

  • @elenag.224
    @elenag.224 2 года назад

    Thank you professor!

  • @ralfbodemann1542
    @ralfbodemann1542 6 лет назад +1

    Excellent video! You should do more videos without holding your notes in your hands. The viewers can better connect to you.

  • @ekueh
    @ekueh 6 лет назад +3

    Ito integral coming next lol

  • @gelegar5048
    @gelegar5048 3 года назад +1

    Estoy aquí porque es el único video con un ejemplo así, con una integral de Riemann Stieltjes a partir de la definición de sumatoria (casi todos usan el teorema del cambio de variable y el del cambio de la derivada de la función integrante).
    Y es que hice el ejercicio de integrar x^2 con alfa x^3 en el intervalo [0,1]... Y si, me salió como en el vídeo (aunque hice diferente el "prework", pero igual llegué al resultado)... Por cierto, sale 3/5!!!!!!

    • @drpeyam
      @drpeyam  3 года назад

      Muy bien!!! 😁

  • @BLESSINGSMBEWE-md5lm
    @BLESSINGSMBEWE-md5lm Месяц назад

    Your smile is contagious 😂

  • @stydras3380
    @stydras3380 6 лет назад

    Dr Peyam did you read your personal messages? :P I've left one :3

  • @GabrielPohl
    @GabrielPohl 6 лет назад +1

    Ooooh this is kind of about what i commented before of the diferential in the argument

  • @zemania4535
    @zemania4535 3 года назад

    Amazing, thank you!

  • @stabulo
    @stabulo 2 года назад

    They have this same problem in Advanced Calculus by David V. Widder. I thought I recognised it haha.

    • @drpeyam
      @drpeyam  2 года назад

      Oh wow, really? What a coincidence :O

    • @stabulo
      @stabulo 2 года назад

      @@drpeyam If interested out of curiosity see page 153 of the second edition. I just recognised the 2/3 in problems I did in similar content.

  • @darpanchaudhary3569
    @darpanchaudhary3569 6 лет назад

    congrats max

  • @千里之行-z5r
    @千里之行-z5r 6 месяцев назад

    thank you sir, keep going

  • @quickmath8290
    @quickmath8290 6 лет назад +1

    You forgot to put d alpha x in the integral at first this kind of confused me

    • @drpeyam
      @drpeyam  6 лет назад +1

      Well yeah, that was on purpose; I wanted to show how the Riemann integral and the Stieltjes integral are similar!

    • @quickmath8290
      @quickmath8290 6 лет назад

      Dr. Peyam's Show i ment at minute 4:10 ... sorry I love your work its no criticism or am I wrong

    • @drpeyam
      @drpeyam  6 лет назад

      QuickMath My bad, you’re right! That’s what I get for improvising 😂

  • @reeeeeplease1178
    @reeeeeplease1178 2 года назад

    11:27 thats not discontinous :P

  • @Uni-Coder
    @Uni-Coder 6 лет назад +1

    For me, it is "still tears"

  • @muuganesan1185
    @muuganesan1185 Год назад

    You didn't give any interpretation and illustration about alpha x. Please do that.

  • @samruddhigajbhiye8544
    @samruddhigajbhiye8544 5 лет назад

    It's too good sir

  • @PabloMartinez-ut8on
    @PabloMartinez-ut8on 4 года назад

    the best! thx

  • @joseluisarmenta
    @joseluisarmenta 6 лет назад

    the are a errro in f(x_i) is diferent yo x_i

  • @bosepukur
    @bosepukur 6 лет назад

    thanks for the video

  • @Ric7574
    @Ric7574 6 лет назад

    Awesome!

  • @jesusalej1
    @jesusalej1 4 года назад

    Int(x da(x))=x a(x) - int(a(x) dx) is another simmilarity.

  • @huehuehuehuehuehuehuehuehu4780
    @huehuehuehuehuehuehuehuehu4780 2 года назад

    goat

  • @armandobuzzini9171
    @armandobuzzini9171 6 лет назад +1

    genial

  • @geraltofrivia9424
    @geraltofrivia9424 Год назад

    Still yes

  • @michelkhoury1470
    @michelkhoury1470 5 лет назад

    Very nice problem

  • @mr.soundguy968
    @mr.soundguy968 3 года назад

    Stieltjes was Dutch

  • @duncanw9901
    @duncanw9901 6 лет назад +1

    Are there any other high school students here?

  • @mike.02
    @mike.02 3 года назад

    the meme now be real