Chapter 6: Homomorphism and (first) isomorphism theorem | Essence of Group Theory

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  • เผยแพร่เมื่อ 11 พ.ย. 2024

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  • @mathemaniac
    @mathemaniac  4 ปีที่แล้ว +25

    Like and share this video series if you think this video series is useful or just enjoy these videos in general. Also, don't forget to subscribe with notifications on!

    • @calvinbriggs3798
      @calvinbriggs3798 3 ปีที่แล้ว

      i dont mean to be off topic but does someone know of a way to log back into an instagram account?
      I was dumb forgot my password. I would love any tricks you can offer me

    • @alejandrogianni8362
      @alejandrogianni8362 3 ปีที่แล้ว

      @Calvin Briggs instablaster :)

    • @calvinbriggs3798
      @calvinbriggs3798 3 ปีที่แล้ว

      @Alejandro Gianni i really appreciate your reply. I got to the site through google and I'm trying it out now.
      Looks like it's gonna take quite some time so I will get back to you later when my account password hopefully is recovered.

    • @calvinbriggs3798
      @calvinbriggs3798 3 ปีที่แล้ว

      @Alejandro Gianni It worked and I now got access to my account again. I'm so happy!
      Thanks so much, you saved my account!

    • @alejandrogianni8362
      @alejandrogianni8362 3 ปีที่แล้ว

      @Calvin Briggs Glad I could help xD

  • @MikhailBarabanovA
    @MikhailBarabanovA 3 ปีที่แล้ว +23

    Bored you said? These lectures are diamonds!

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +2

      Thanks so much for the appreciation!

  • @abjectindividual1603
    @abjectindividual1603 7 หลายเดือนก่อน +3

    Putting the mathematical rigor/jargon click into place with such enlightening expositions is so satiating,thank you.

  • @kabirbelgikar7095
    @kabirbelgikar7095 4 ปีที่แล้ว +32

    I'm currently not at the stage where these (group theory) videos will help me very much (just started discrete math very recently). However, knowing the quality of your videos I'm sure that they'll help me a lot when I decide to learn this beautiful subject. Don't ever stop making these! I'm sure your channel will blow up soon.

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว +2

      I just came across your comment and I was curious. How did discrete math go, and did you end up taking group theory?

  • @zegevlier7076
    @zegevlier7076 4 หลายเดือนก่อน +1

    I've had a really tough time understanding the isomorphism theorem in my group theory course, and this video helped a lot. Thank you for making it.

  • @tricanico
    @tricanico 4 ปีที่แล้ว +26

    Thank you!!
    It makes me a little bit sad how many views this has. But people will realize sooner or later!

  • @joaofrancisco8864
    @joaofrancisco8864 3 ปีที่แล้ว +18

    I just started watching this series now, but I just came here to say that I'm not bored at all!!! Your videos are great :)

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Glad you like them!

  • @bobtheblob728
    @bobtheblob728 3 ปีที่แล้ว +6

    this series is so good!! I'm so glad I stumbled upon it. it looks like the TH-cam algorithm is starting to recommend to more people, I hope that translates to more people appreciating your fantastic content :)

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +2

      Glad you like the content!

  • @Alpasonic
    @Alpasonic 3 ปีที่แล้ว +1

    Talking about technical aspects of your videos - I think your way of articulation/pronunciation/separation of the words and the speed of your talk is just optimal. And perfectly relevant to the Purpose. Thank you for your videos. And best wishes.

  • @BrendaGarcia-gq1sv
    @BrendaGarcia-gq1sv 4 ปีที่แล้ว +5

    Thank you for making this video. I had trouble understanding Abstract Algebra in undergrad, and now that I’m in grad school I am struggling even more because I couldn’t understand homomorphism and isomorphism. I kept looking for videos with visuals and I’m glad I came across this video, it really helped me understand. I will be sharing it with my friends.

    • @mathemaniac
      @mathemaniac  4 ปีที่แล้ว +1

      Wow, thank you for the kind words! Glad that it helps!

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว +1

      Hey I just came across your comment and was curious. How is grad school going, or did you already graduate?

    • @BrendaGarcia-gq1sv
      @BrendaGarcia-gq1sv 2 ปีที่แล้ว +1

      @@PunmasterSTP I graduated this May! And I ended up with an A in Abstract Algebra :)

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว

      @@BrendaGarcia-gq1sv I’m very glad to hear it!

  • @sachs6
    @sachs6 4 ปีที่แล้ว +5

    We nurture great enthusiasm for the idea! We wouldn't mind some more on properties of specific types of groups either. This topic is so important, but so dryly explained elsewhere, that we are surely thirst for your juicy intuitions. Thanks a lot! Also, the more examples the better

    • @mathemaniac
      @mathemaniac  4 ปีที่แล้ว +2

      Thanks so much for the compliment! I did say that I would put an end to the series in the last chapter of the video series though... I will try to see if there is any more demand to the continuation of this video series!

  • @pepepepe5802
    @pepepepe5802 2 ปีที่แล้ว +2

    Thanks for doing this series! Loved it. I've been self studying group theory (which means I'm learning proofs of the theorems along with intuitions) and these videos were helpful. I often find that proofs are not difficult to do when you have a solid intuition of the concept.

    • @mathemaniac
      @mathemaniac  2 ปีที่แล้ว +2

      Yes! That's the purpose of this video series!

    • @pepepepe5802
      @pepepepe5802 2 ปีที่แล้ว +1

      @@mathemaniac Can you recommend me a book/notes for group theory that centers around intuition?

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว

      Hey I know it's been six months, but I was just curious how your self-study has been going. I'm also studying a bit myself, just off and on from time to time...

    • @pepepepe5802
      @pepepepe5802 2 ปีที่แล้ว +1

      @@PunmasterSTP Amazing honestly. But that's always been the case for me, for some reason. I do better on my own than with the help of teachers probably because I like to take my time and not cram everything in an hour lecture. I ace all my exams if that's anything to go by? So yeah, self study, totally recommended 10/10.

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว +1

      @@pepepepe5802 That’s wonderful to hear! I never took abstract algebra, but I’ve been fascinated to learn about it.

  • @sebastianmarshall5188
    @sebastianmarshall5188 3 ปีที่แล้ว +3

    Honestly this content is unreal. Thank you for helping me with Math 113!

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Glad to help!

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว

      I'm just curious; did you take any more math classes after 113, and if so, which ones?

  • @qwertyuiopsmile
    @qwertyuiopsmile 2 ปีที่แล้ว

    The slide you have at 11:18 is so helpful in summarizing the contents of the theorem. Extremely helpful in studying for an abstract algebra exam. Thank you so much!

  • @nielsgeudens4650
    @nielsgeudens4650 7 หลายเดือนก่อน

    Thanks a lot for making these videos, they are actually making me understand the subject matter unlike my uni classes. I hope you get the recognition you truly deserve.

  • @scug-jn4my
    @scug-jn4my 2 หลายเดือนก่อน

    The visuals of your videos are so helpful. Thank you for making them!

  • @abbasmehdi2923
    @abbasmehdi2923 4 ปีที่แล้ว +5

    Well ! I do not understand the video but i know that it will be intresting and informative for me when i will move in higher classes. Never stop uploading such videos . Earlier I thought symmetries are not intresting but your content changed my ideas.

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว

      Hey I was just curious if you ended up taking a group theory (or similar) class.

  • @alexnagle575
    @alexnagle575 3 ปีที่แล้ว +4

    I took two courses in abstract algebra in Uni, one from a a famous group theorist. I am a visual learner, so pure math was always a challenge, but providing visual descriptions of symmetries and how they related to various subgroups (right, left, normal, etc.) was always lacking. These video are great, and can provide valuable context to a rigorous study of the topic. Nice work, and keep going. Posterity will, in my opinion, treat your efforts kindly.

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Thanks so much for the appreciation!

    • @PunmasterSTP
      @PunmasterSTP 2 ปีที่แล้ว

      I was just curious; who was the famous group theorist?

  • @marcocecchi9853
    @marcocecchi9853 4 ปีที่แล้ว +9

    Keep this going!
    Loving this series, if you keep posting more i'll be sure to follow

    • @mathemaniac
      @mathemaniac  4 ปีที่แล้ว +2

      Due to popular demand, I have actually extended this series to chapter 7 and a little summary of the entire video series; but I did put a stop there... I might do an "Intermediate group theory" series as opposed to "Essence" in the future, but only if I can find a good way to visualize the other group theory concepts.
      I am still making a lot of interesting mathematics videos, even though my upload schedule isn't too consistent. I try to upload at least monthly, but honestly there is no guarantee on this.

  • @abbasmehdi2923
    @abbasmehdi2923 4 ปีที่แล้ว +6

    Sad to see so less views....i know that u will lead...keep up the great content.

  • @alexman97412
    @alexman97412 4 ปีที่แล้ว +4

    Im french and I understand this better than my french lessons , nice video + 1 subscriber

    • @mathemaniac
      @mathemaniac  4 ปีที่แล้ว +1

      Awesome! Glad that this video helps!

  • @sagnikbhattacharya1202
    @sagnikbhattacharya1202 3 ปีที่แล้ว +2

    I am LOVING this series :D

  • @yueteng2046
    @yueteng2046 3 ปีที่แล้ว +5

    Your videos are excellent! Definitely not bored

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Glad you like them!

  • @radoslavhubenov1945
    @radoslavhubenov1945 3 ปีที่แล้ว +3

    Thank you! Very elegantly explained! You've got yourself a new sub, I'm sure many more will follow with time!

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Awesome, thank you!

  • @PunmasterSTP
    @PunmasterSTP 2 ปีที่แล้ว +1

    Homomorphism? More like "Hurry up, this is incredible, isn't it?" Your videos are so good, and I can't wait to watch the rest!

  • @escher4401
    @escher4401 2 ปีที่แล้ว +1

    It 'd be interesting if you show an application of group theory where it's really essential for the proof. Some problem that could not or hardly be solved in a strait forward way

  • @steveschwartzm.d.7362
    @steveschwartzm.d.7362 2 ปีที่แล้ว +1

    You asked about what the viewers might be interested in knowing about. I would be interested in knowing how GROUP THEORY has been used to solve real world problems. In Physics they use the rotation matrices and various subgroups for Maxwell's equations U(1), QED - SU(2) and QCD. Well that is nice but it does not seem like they have done anything other than a very accurate description of all the possibilities. This is useful overall. Was it used to determine all the possible Path Integrals in QED? Can GROUP THEORY be used to describe wave interactions? There are phases, phase velocity and group velocity. It seems like this would be perfect for GROUP THEORY. Is there computer software you can use to put in what you know about a system in regard to the groups? And this software will tell you more based upon what you already know. It seems like GROUP THEORY would be perfect for the quantum. Because everything is a linear combination of the quantum. Is it being used in that manner. And there seems on first glance to be a correlation between Calculus, integrals and group theory. Because when you integrate, you really need to know what groups to integrate by. For volume the group is area and so forth. But how powerful could this be?

  • @vishwanathlohar7326
    @vishwanathlohar7326 3 ปีที่แล้ว +3

    Plz keep uploading more videos..
    Good explainaton.

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +1

      Thanks so much for the appreciation! I am definitely not doing TH-cam full time, so I can only upload occasionally, but hopefully each upload is a good one!

  • @golden_smaug
    @golden_smaug ปีที่แล้ว

    Super clear explanations, though I'm gonna rewatch the video several times to make sure I get everything right

  • @sayantakrkuila2602
    @sayantakrkuila2602 2 ปีที่แล้ว +2

    Very very very good experience, thank you.

    • @mathemaniac
      @mathemaniac  2 ปีที่แล้ว +1

      Thanks for the compliment!

  • @friedrichfreigeist3292
    @friedrichfreigeist3292 3 ปีที่แล้ว +1

    I'd love to see something about Lie Groups and Lie Algebras

  • @hyperduality2838
    @hyperduality2838 3 ปีที่แล้ว

    Same is dual to different.
    The normal subgroup is dual to homomorphism (factor group) synthesizes the kernel.
    The image (co-domain) is a copy, equivalent or dual to the factor group (domain) - the 1st isomorphism theorem.
    Isomorphism (absolute sameness) is dual to homomorphism (relative sameness or difference).
    Injective is dual to surjective synthesizes bijective or isomorphism.
    Similarity, equivalence = duality!
    Isomorphism represents the orthogonal complement or the dual of the kernel.
    Homo is dual to hetero.

  • @Kloobgumph
    @Kloobgumph 3 ปีที่แล้ว +2

    Thank you!

    • @mathemaniac
      @mathemaniac  3 ปีที่แล้ว +2

      Hopefully this helps!

  • @學習中的哈密瓜
    @學習中的哈密瓜 5 หลายเดือนก่อน

    please introduce more applications 🙏

  • @nerdkid8251
    @nerdkid8251 ปีที่แล้ว

    Awesome, extremely helpful

  • @rajaryan5496
    @rajaryan5496 ปีที่แล้ว

    But what should e the value of phi to prove the second isomorphism from the first one? And how do we do it? It would be great if someone could throw some light on this, any hit would work, PLEASE.

  • @carlosraventosprieto2065
    @carlosraventosprieto2065 9 หลายเดือนก่อน

    this was amazing

  • @SphereofTime
    @SphereofTime 7 หลายเดือนก่อน +1

    9:06

  • @SphereofTime
    @SphereofTime 7 หลายเดือนก่อน +1

    0:16

  • @johnhippisley9106
    @johnhippisley9106 2 ปีที่แล้ว

    doesn’t an isomorphism also have to be onto?

  • @SphereofTime
    @SphereofTime 7 หลายเดือนก่อน

    11:00

  • @fraserpye9667
    @fraserpye9667 ปีที่แล้ว +1

    Homosexual

  • @jaca2899
    @jaca2899 3 ปีที่แล้ว

    WHAT ABOUT COLORBLIND PEOPLE??!!! REEEEEEEEEEE

  • @vanessamichaels9512
    @vanessamichaels9512 3 ปีที่แล้ว

    bullshit, if they're isomorphic, they're the same.

  • @FunctionalIntegral
    @FunctionalIntegral 4 ปีที่แล้ว

    Is there any reason that you permanently emphasis words you are saying? I mean you don't need to give yourself too much pressure.
    SSSSSSubgroup --> Subgroup
    ROOOOOOTATIONNNN -> Rotation
    Loosen up a little!

    • @mathemaniac
      @mathemaniac  4 ปีที่แล้ว

      Maybe it is subconscious. Will improve this in later videos :)

    • @sachs6
      @sachs6 4 ปีที่แล้ว +1

      As a non native English speaker, thanks a lot for the clarity in those difficult words. They have, after all, just been introduced by your videos to us viewers.