Real Analysis 2 | Sequences and Limits

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This is my video series about Real Analysis. We talk about sequences, series, continuous functions, differentiable functions, and integral. I hope that it will help everyone who wants to learn about it.
This part 2 of the series with 64 videos. Here we define important notions like convergence and divergence.
00:00 Introduction
00:15 Definition of a sequence
01:50 Examples
06:06 Definition of convergence and divergence
08:55 Example and Archimedean property
11:56 Credits
#RealAnalysis
#Mathematics
#Calculus
#LearnMath
#Integrals
#Derivatives
I hope that this helps students, pupils and others. Have fun!
(This explanation fits to lectures for students in their first and second year of study: Mathematics for physicists, Mathematics for the natural science, Mathematics for engineers and so on)
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Пікірлер: 85

  • @ChrisSwaningAround
    @ChrisSwaningAround3 жыл бұрын

    Great stuff You do a great job of filling in those gaps the modern education can leave in a mathematics education 😁 Keep it up!

  • @alexanderthegreat5352
    @alexanderthegreat53523 жыл бұрын

    This is very helpful, but as a note I think it's more intuitive to explain the Archimedean property as : for any real number there is a natural number bigger than it and then use the corollary (there exist 1/n for all r>0 such that so and so) to prove love the good work

  • @brightsideofmaths

    @brightsideofmaths

    3 жыл бұрын

    Yeah, this might be a matter taste for the Archimedean property. Thanks for the explanation there!

  • @chilledvibes99

    @chilledvibes99

    3 жыл бұрын

    yeah at uni we learn it this way :)

  • @IsomerSoma
    @IsomerSoma3 жыл бұрын

    I am watching your lectures as preparation for my 1st Semester. Thank you very much.

  • @PunmasterSTP

    @PunmasterSTP

    2 жыл бұрын

    How'd your first semester turn out?

  • @realAhmedAbdElGhany
    @realAhmedAbdElGhany2 жыл бұрын

    i really like this channel, i really support this great effort i wish success for you in all the fields of your life !

  • @brightsideofmaths

    @brightsideofmaths

    2 жыл бұрын

    Thank you so much 😀

  • @Negs42

    @Negs42

    Жыл бұрын

    @@brightsideofmaths Eine Anfrage bitte; Kannst du eine Serie über Differentialgeometrie machen? Danke

  • @leyashalabi7209

    @leyashalabi7209

    Жыл бұрын

    الله عليك يا احمد

  • @researcher--
    @researcher--3 жыл бұрын

    You are an amazing teacher!

  • @vickysharma2949
    @vickysharma29492 жыл бұрын

    Gefällt mir, wie du erklärst!😊. viel besser als Professoren an der Hochschule Baden Württemberg. Danke!

  • @chin6796
    @chin67963 жыл бұрын

    Thanks for uploading this series

  • @murilopalomosebilla2999
    @murilopalomosebilla29992 жыл бұрын

    Beautiful presentation!

  • @suryanarayanachebolu7870
    @suryanarayanachebolu78703 жыл бұрын

    Hats off for your good Job.

  • @dextreme1754
    @dextreme1754 Жыл бұрын

    Just started with this whole series I'm studying computer engineering and now I realised with your videos and explanation that Analysis is actually not that hard atleast on this level tho i had problems with even these simple concepts i guess it really depends on the teacher if the student can learn what they teach so I'm very grateful for you! Thank you!

  • @bArda26
    @bArda262 жыл бұрын

    Wow amazing and thank you for making these videos !

  • @PunmasterSTP
    @PunmasterSTP2 жыл бұрын

    Sequences and limits? More like “Surely this playlist contains only hits!” Thanks again for making and sharing so many high-quality videos.

  • @declandunleavy8985
    @declandunleavy89852 жыл бұрын

    Superb explanation as usual. You are a gifted communicator. One tiny piece of feedback - when watching videos on youtube there are many times when I want to pause the video to take in what is on the screen, like many other viewers I'm sure. This action always brings up the progress bar with its icons. If the text is written right to the very bottom of the screen it gets covered by the icons and can't be viewed on pause. Even after unpause it takes several seconds for the icons to disappear. An example occurs at the end of this video and I've noticed it on other vids too. Would be helpful in future vids if you left the bottom 5% of the screen blank. More an issue with youtube than your vids but unlikely they will change this anytime soon. Anyway - I hope you keep up the incredible work. Thanks!

  • @brightsideofmaths

    @brightsideofmaths

    2 жыл бұрын

    Thank you very much! There is a really helpful feedback I also got before. I try to avoid writing at the bottom but sometimes I also want to show the stuff above at the same time and then I really want to use the whole screen. One possibility for you would be to use the pdf versions of the videos while watching the video. However, I try to be more careful in the next videos and try to avoid the bottom of the screen more often :)

  • @laviekolchinsky9441
    @laviekolchinsky94413 жыл бұрын

    Are you finished the series on constructing the basic number sets (R and C)? I've watched all the series you have except for these ones because I want to binge the full constructions and formalisms :)

  • @brightsideofmaths

    @brightsideofmaths

    3 жыл бұрын

    Thank you! The construction of the real and the complex numbers is finished. However, I will add some videos about complex numbers soon but they are not need for the real analysis course here :)

  • @user-kn6tm3zd1o
    @user-kn6tm3zd1o10 ай бұрын

    Thank u❤ You’re Genius sir.

  • @pratikkumar311
    @pratikkumar3113 жыл бұрын

    Please upload more video on sequence and series.

  • @gopinathan2095
    @gopinathan20953 жыл бұрын

    Great insight I got...

  • @pratikkumar311
    @pratikkumar3113 жыл бұрын

    Thanks

  • @inthebackwiththerabbish
    @inthebackwiththerabbish2 жыл бұрын

    You are amazing Dankeschön

  • @kamildiril9544
    @kamildiril95442 ай бұрын

    Thank you very much for an excellent explanation. I didn't understand the logic epsilon et N for 2 years. I understand them now.

  • @brightsideofmaths

    @brightsideofmaths

    2 ай бұрын

    You are welcome!

  • @gianniskallionis3300
    @gianniskallionis330011 ай бұрын

    as a greek, im proud of how u pronounce ε , good job !

  • @shaunsankar5397
    @shaunsankar53975 ай бұрын

    You're a great teacher, props!

  • @sadececns00
    @sadececns008 ай бұрын

    Waowww you 100% cleansed all my confusions Thanks Sir!!!!!!!

  • @brightsideofmaths

    @brightsideofmaths

    8 ай бұрын

    Glad it helped! :) And thanks for the support!

  • @sadececns00

    @sadececns00

    Ай бұрын

    ​@@brightsideofmaths Hello Sir! I'm watching the video again after 7 months I realized everything is much more clear now than it was 7 months ago. I have a question can we simply choose N=1/ε instead of showing for Archimedean property

  • @brightsideofmaths

    @brightsideofmaths

    Ай бұрын

    @@sadececns00 The Archimedean property is given and we have to use it :)

  • @sadececns00

    @sadececns00

    Ай бұрын

    ​@@brightsideofmaths Thanks for your reply : ] I follow another channel, too. And the teacher always do scratch work first to find delta (or N) then he chooses delta based on the scratch work. I haven't seen that he applies Archimedean Property- he just lets. He does this during the limits Epsilon- Delta proofs or N-delta M-delta proofs (for infinity).. Could you please tell me the reason why he lets Delta \ N

  • @DrPeterkuah
    @DrPeterkuah4 ай бұрын

    That is the best convergent definition I have ever seen /read.

  • @brightsideofmaths

    @brightsideofmaths

    4 ай бұрын

    Nice! And thanks for your support :)

  • @glennlehman9608
    @glennlehman9608 Жыл бұрын

    I like the pace and content of your videos. Personally, I find them easier to follow than my text, so I appreciate the effort you put into the explanations. At the end of the video, you mention the Achimediam Property - I am not familiar with this. Do you have a video that explains the property?

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Yes, you can find it here: tbsom.de/s/slm My Start Learning Mathematics series covers the construction of the real numbers. You don't need all the videos for understanding the Archimedian property. And thanks for liking me videos :)

  • @glennlehman9608

    @glennlehman9608

    Жыл бұрын

    @@brightsideofmaths I think I might need all the videos ... Thanks Construction of the real numbers has been confusing me

  • @dawardeka5404
    @dawardeka540410 ай бұрын

    lots of Love from IIT Bombay

  • @hz6612
    @hz66127 ай бұрын

    Thank you so so so much !!!

  • @peki_ooooooo
    @peki_ooooooo Жыл бұрын

    Good explanation.

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Glad you think so!

  • @aseelmathematics2778
    @aseelmathematics27782 жыл бұрын

    Great !!!!

  • @shalvagang951
    @shalvagang9512 жыл бұрын

    hey you told that you will make a lecture series on algebraic geometry or differntial geometry so when you are making it

  • @brightsideofmaths

    @brightsideofmaths

    2 жыл бұрын

    I try to do this on this year :)

  • @sivaramd5637
    @sivaramd5637 Жыл бұрын

    So, a finite sequence never converges to any number "a"? Since, we can always choose 0 < epsilon < |a_n - a|.

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    A finite sequence is just a tupel and convergence makes not much sense there.

  • @sivaramd5637

    @sivaramd5637

    Жыл бұрын

    @@brightsideofmaths Oh, okay. So, a sequence is infinite by definition (in real analysis)?

  • @abdeljebbarmnahaj7641
    @abdeljebbarmnahaj76416 ай бұрын

    Great job

  • @shalvagang951
    @shalvagang9512 жыл бұрын

    hey can you also do a video on algebraic geometry and differential geometry

  • @brightsideofmaths

    @brightsideofmaths

    2 жыл бұрын

    Yes, I can :)

  • @shalvagang951

    @shalvagang951

    2 жыл бұрын

    @@brightsideofmaths so when you are planning to do that because I am very excited

  • @brockobama257
    @brockobama257 Жыл бұрын

    I think I might pass real analysis

  • @user-cd9gw4qb4s
    @user-cd9gw4qb4s Жыл бұрын

    I have a question. Why is 1 to the power of infinty indetermined?

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Infinity is not a well-defined number for powers.

  • @vale_gamer5228
    @vale_gamer52284 ай бұрын

    Hello. I love the videos. Helping me a lot. Tho i still have a questions. Namely, what exactly is N(Not the N of natural numbers but just the capital N)? What does it represent???

  • @brightsideofmaths

    @brightsideofmaths

    4 ай бұрын

    Thanks! N represents a natural number, an index. So N could have the value 5, for example.

  • @dodysumargo
    @dodysumargoАй бұрын

    Does a limit pf a sequence mean the largest value that sequence has?

  • @waraamir1487

    @waraamir1487

    Ай бұрын

    No for example if we take (-1)'n/n

  • @cprt.d9471
    @cprt.d9471 Жыл бұрын

    Wie nennt man die neighbourhood auf Deutsch? Wird es in der Mathematik ebenso mit Nachbarschaft übersetzt? :'D Und wie wird der archimedian properity übersetzt?

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Neighbourhoood = Umgebung :)

  • @maxpercer7119
    @maxpercer7119 Жыл бұрын

    Fun challenge, negate formally the definition of convergence. For a bigger fun challenge, show that the sequence {-1, 1, -1, +1, ... } , given by the rule (-1)^n, does not converge. (Hint, it is not enough to show that the sequence does not converge to a specific number , e.g. 1 or -1, but we must show that it does not converge to any real number)

  • @leochen4584
    @leochen45849 ай бұрын

    at 10.28 why is it not 1/n >=1/N cos like it said n>=N

  • @brightsideofmaths

    @brightsideofmaths

    9 ай бұрын

    1/2 is bigger than 1/3 but 3 is bigger than 2.

  • @ra1n0
    @ra1n0 Жыл бұрын

    8:09 shouldn't the definition of convergence state that |an - a| with the latter a being the limit you picked (the red a)?

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Yes, it should be a red a :)

  • @tsunningwah3471
    @tsunningwah34716 ай бұрын

    bravo

  • @intuitivelyrigorous
    @intuitivelyrigorousАй бұрын

    Why |an-a| less than epsilon cant be |an-a| less than or equal to epsilon? Or it can be but both definition will prove the same convergence.(As there is always a number between two numbers so we will always have some other epsilon if not the epsilon which generates the case of equal to). Then is there any significance of choosing less than rather than less than equal to. If it cant then the case of equal to must be redundant, if so then how or the expression with equal to must not give proper idea of convergence.

  • @brightsideofmaths

    @brightsideofmaths

    Ай бұрын

    < eps and ≤ eps give the same definition.

  • @chunyunyang8999
    @chunyunyang8999 Жыл бұрын

    Hello, I am a student from mainland China, because of various reasons I can't pay, can you give me a PDF and channels to get your course

  • @dodysumargo
    @dodysumargoАй бұрын

    Does a limit of a sequence mean the largest value the sequence can give?

  • @brightsideofmaths

    @brightsideofmaths

    Ай бұрын

    No!

  • @dodysumargo

    @dodysumargo

    Ай бұрын

    @@brightsideofmaths alright then, so what does it mean exactly?

  • @brightsideofmaths

    @brightsideofmaths

    Ай бұрын

    @@dodysumargo The value the sequence approaches for n to infinity.

  • @dodysumargo

    @dodysumargo

    Ай бұрын

    @@brightsideofmaths Oh, alright then thanks for the info, im new to real analysis

  • @brightsideofmaths

    @brightsideofmaths

    Ай бұрын

    @@dodysumargo You are welcome! You can join the community forum to discuss more problems :)

  • @Rayglobster
    @Rayglobster Жыл бұрын

    Why can’t you pronounce your R’s????

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    Genetic defect!

  • @Rayglobster

    @Rayglobster

    Жыл бұрын

    @@brightsideofmaths Sad!

  • @brightsideofmaths

    @brightsideofmaths

    Жыл бұрын

    There are worst things than that :)