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Dihedral Group (Abstract Algebra) 

Socratica
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The Dihedral Group is a classic finite group from abstract algebra. It is a non abelian groups (non commutative), and it is the group of symmetries of a regular polygon. This group is easy to work with computationally, and provides a great example of one connection between groups and geometry.
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We recommend the following textbooks:
Dummit & Foote, Abstract Algebra 3rd Edition
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Milne, Algebra Course Notes (available free online)
www.jmilne.org/math/CourseNote...
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Teaching​ ​Assistant:​ ​​ ​Liliana​ ​de​ ​Castro
Written​ ​&​ ​Directed​ ​by​ ​Michael​ ​Harrison
Produced​ ​by​ ​Kimberly​ ​Hatch​ ​Harrison
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Опубликовано:

 

2 мар 2014

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Комментарии : 186   
@Socratica
@Socratica 2 года назад
Sign up to our email list to be notified when we release more Abstract Algebra content: snu.socratica.com/abstract-algebra
@helgemeyer8363
@helgemeyer8363 8 лет назад
"When you talk to your friends about group theory..." Yeah, like my friends cared about math. Excellent video, though.
@Andre83572
@Andre83572 6 лет назад
Friends? What are those?
@brandonhughes645
@brandonhughes645 5 лет назад
time to get new friends fool. lol
@howmathematicianscreatemat9226
@howmathematicianscreatemat9226 3 года назад
those "friends" will soon not be able to be employed anymore when robots take over. Only creative jobs will survive. So you will surpass them later if they don´t respect your interests now!
@Grassmpl
@Grassmpl 2 года назад
You made the wrong friends
@PMA_ReginaldBoscoG
@PMA_ReginaldBoscoG 2 года назад
I don't know why but I read your comment in Electroboom Mehdi Sadaghdar's voice 😂
@jessicalynn4415
@jessicalynn4415 9 лет назад
She really broke this down perfectly.
@markdstump
@markdstump 7 лет назад
She doesn't write these, but her delivery is nice :)
@judithbenami3964
@judithbenami3964 3 дня назад
@@markdstump I am so upset I think she is AI...
@markdstump
@markdstump 3 дня назад
@@judithbenami3964 Don't worry, Liliana​ ​de​ ​Castro is real.
@jamesthomson4186
@jamesthomson4186 7 лет назад
"when you're talking to your friends about abstract algebra"...
@tylerw.1414
@tylerw.1414 5 лет назад
LOL THIS
@dionsilverman4195
@dionsilverman4195 7 лет назад
Just fantastic presentation of this material. I wish I'd found this years ago. These are very clear, accessible, and engaging.
@rngwrldngnr
@rngwrldngnr 3 года назад
Going through this playlist again trying to refresh myself to get back into Pinter's A Book of Abstract Algebra, hopefully to finish it this time. Its very educational and well made. What particularly stands out is how well the later videos were slotted into the playlist to cover gaps, it works better than I'd have thought possible.
@oyaoya2468
@oyaoya2468 Год назад
ngl you explained it really well. Its not that I was ungrateful to what my book has taught so far, but you has enlightened me a lot to digest such "abstract" concept.
@RuthJatibOConnor
@RuthJatibOConnor 9 месяцев назад
Loved this. Thank you! As an artist, I’m constantly looking for visual representations of abstract themes and ideas. I became aware of the Dihedral group by a friend a few years ago and created an art piece illustrating this concept. So interesting!
@MuhammadTahir-xi6ve
@MuhammadTahir-xi6ve 4 года назад
I like your clear way of talking. I meant your lecture about dihedral groups is very clear and to the point. "May you remain healthy and happy "
@tadashimori
@tadashimori 10 лет назад
Not sure if it would ever be possible, but you should try to bring the polynomial function of degree 5 problem in an easy way for everyone to understand. Maybe solvable and super solvable groups... I remember studying like crazy to get these topics, and I'd love to see how you would explain it xD.
@gracemisere6994
@gracemisere6994 8 лет назад
And you are a wonderful presenter!
@Socratica
@Socratica 8 лет назад
You are so kind! Thank you for watching. :)
@franciscodanielquiroz9904
@franciscodanielquiroz9904 3 года назад
You make me feel like I can understand every single topic in Mathematics. I love you!
@Treviscoe
@Treviscoe Год назад
Thanks for this video, you cleared up a confusion I had about the two styles of notation (D6 can either refer to the symmetry group of a hexagon or that of an equilateral triangle).
@HaiderAli-cp4rp
@HaiderAli-cp4rp 7 лет назад
A very good and comprehensive lecture on Dihedral groups... Please also upload videos on Alternating groups, transpositions, contingency permutations, even and odd permutations, signum of permutations, Simple groups
@PunmasterSTP
@PunmasterSTP 3 года назад
That was a really good heads-up about the notation; I will definitely di-heed your advice!
@TheKiskus
@TheKiskus 7 лет назад
You've just earned yourself a new subscriber. This was a really great video that broke down the abstraction level to a point where it's understandable and now it's possible to understand the more complicated stuff regarding the subject. Thank you!
@Socratica
@Socratica 7 лет назад
We're so glad you found our video helpful! This was wonderful to hear. We're so glad you are learning Abstract Algebra with us. Happy New Year! :)
@TheKiskus
@TheKiskus 7 лет назад
I am studying math and taking a course about groups this semester and rings next semester. I am happy that I found your channel it's very easy to understand. Happy New Year to you as well! :)
@saeedanwar5262
@saeedanwar5262 7 лет назад
dear how can i get relative theorems on each topic???????
@jongxina3595
@jongxina3595 3 года назад
Damn I wish you guys did more playlists like this on other math topics as well. You guys are awesome!
@vivelesport8197
@vivelesport8197 3 года назад
Clearly done! Workmanly! For the reflection i suggest it to be done very slowly to see and understand how vertices are reversed 2 by 2... You deserve encouragement...!
@mu.makbarzadeh2831
@mu.makbarzadeh2831 3 года назад
Thank you so much! I really have become familiar with many things in mathematics by you!
@roscelledalman6814
@roscelledalman6814 8 лет назад
more videos about abstract algebra please
@joshjucutan
@joshjucutan 4 месяца назад
So I'm working on a Senior Project with symmetries relating it to art, and you broke this down so beautifully!
@Socratica
@Socratica 4 месяца назад
Love this idea! 💜🦉
@RoyYakoobAlHakeem
@RoyYakoobAlHakeem 5 лет назад
The last message was funny and made me subscribe!
@107ashrafulmasum5
@107ashrafulmasum5 7 лет назад
excellent job.you're amazing teacher
@xanadudeboston3344
@xanadudeboston3344 5 лет назад
This is a perfect explanation of this topic. I came in asking, “what the hell is that?” and came out saying, “I’ll know what’s going on next class.” Great work. The animations spelt it out well.
@shwetabhsrivastava594
@shwetabhsrivastava594 10 лет назад
Can you make one video related with group action and orbit? Thanks
@SigmaSixSoftware
@SigmaSixSoftware 2 года назад
This explained the whole section on dihedral sets better than my textbook thank you
@JohnCLiberte
@JohnCLiberte 7 лет назад
absolutely amazing :) love your humour. Who is doing these animations? They are of a very very high quality.
@Socratica
@Socratica 7 лет назад
Thank you so much, Jacob! We're so glad you've subscribed to our channel! We're a small team here at Socratica. We do most of our work in the Adobe Suite (Premiere, After Effects). Thank you for your kind comment! :)
@howmathematicianscreatemat9226
@howmathematicianscreatemat9226 3 года назад
yes, they are a didactical masterpiece!
@Socratica
@Socratica 2 года назад
Socratica Friends! If you're wanting to improve your study skills, we WROTE THIS BOOK all about how we figured it out! How to Be a Great Student ebook: amzn.to/2Lh3XSP Paperback: amzn.to/3t5jeH3 or read for free when you sign up for Kindle Unlimited: amzn.to/3atr8TJ
@goodjunksam8149
@goodjunksam8149 7 лет назад
Your fluidity is as beautiful and abstract as yoga with Adriene. Higher math made fun. Next I think I will go over to watch Hans Rosling. Blessings.
@wangyoutian
@wangyoutian 7 лет назад
Beautiful video. Thanks
@nazeerjehan6550
@nazeerjehan6550 3 года назад
Just Amazing.. The way you teach is very lucid.👍
@sanjursan
@sanjursan 9 лет назад
Maybe show this vid BEFORE the vid on subgroups. Then you can demonstrate the two (non-trivial) subgroups of the equilateral triangle. Just a thought. Otherwise, the information and production of this series is EXCELLENT!
@chandlerbing5434
@chandlerbing5434 4 года назад
Great videos loved your explanation , please make more videos on group theory about the cyclic groups in details
@24chiku
@24chiku 5 лет назад
Please consider making a set of videos on point set Topology.
@muhannadayoubi1433
@muhannadayoubi1433 4 года назад
Her voice is very calm and her explanation is very clear and easy to follow. The last part cracked me up 😆 but I do have a question that has been lingering on my mind. When I studied Real Analysis, it was alway stressed that we must always use analytical methods and never rely on our geometric intuition when writing proofs (we can rely on it, of course, to get a feel of the problem and proof). But now in abstract algebra, we're freely discussing geometry and symmetries albeit I haven't seen anyone formalise what these symmetries mean. What do you think of this?
@toasteduranium
@toasteduranium Год назад
Let me know when someone figures this out
@abouland9404
@abouland9404 Год назад
Even the most abstract concepts in advanced math come from something more intuitive, whether it's examples, geometric intuition, or something else more concrete. It is always a good idea to be able to think of these examples when thinking of the definitions or theorems. When writing a proof, you do not use these ideas in your proof and instead keep it formal, which I think what was being emphasized during your Real Analysis class. Unfortuantely, many professors ignore the intuition and just give formal definitions and proofs without motivating them or giving a clear picture of the concept first. In this channel, the videos are meant for understanding, and not formalism, which is why they are clear and inutitive.
@Xan_the_r
@Xan_the_r 4 года назад
Thank you so much. Your videos are amazing.
@gopalkhadka2077
@gopalkhadka2077 6 лет назад
It's Awesome explanation by you ... Thanks for making this video😊
@dylano5595
@dylano5595 5 лет назад
You should write a full abstract algebra textbook, written the way you speak now. That would be an awesome reference for me :-)
@IjazKhan-fm4si
@IjazKhan-fm4si 3 года назад
I miss ur channel.ur skill communications are very amaizing
@ritikanegi1604
@ritikanegi1604 6 лет назад
Thank you ma'am, just want to request you to make video on class equations.
@Monika_atri10
@Monika_atri10 2 года назад
I was searching for geometrical representation of Dn group and finally i got ur video ..its osm
@santoshnegi5693
@santoshnegi5693 5 лет назад
Giving ideas is more important... That what u do.. Thanks💖
@sarkarimaster-mohanpatel6027
@sarkarimaster-mohanpatel6027 2 года назад
Though I am not a mathematica student but I like to watch you. Your teaching is very attractive... I feel I need learn mathematics from very beginning...
@MrVictius
@MrVictius 9 лет назад
Nice vids. Just earned yourself a subscriber
@radicalpotato666
@radicalpotato666 2 года назад
Thank you very much. I have subscribed.
@qaziarshad939
@qaziarshad939 2 года назад
More videos about Abstract Algebra, Real Analysis, and Topology please
@jonny1996ahh
@jonny1996ahh 7 лет назад
Here you go subscribed! I have an exam in abstract algebra in 2 weeks :D
@celsogrodriguez1940
@celsogrodriguez1940 2 года назад
Currently, I have a Bad Math Teacher and that is not because he doesn't know about the topics but He can not explain to us what is a dihedral group. Now with your explanation, I can understand what a Dihedral group means. I am very grateful to you. Best Regards from Guatemala.
@Socratica
@Socratica 2 года назад
We're so glad we could help. Try to find a good study group so you can help each other - hang in there!! 💜🦉
@ashfaqhussain6940
@ashfaqhussain6940 3 года назад
Absolutely brilliant effort
@howmathematicianscreatemat9226
@howmathematicianscreatemat9226 3 года назад
yes. It´s very sad she gets so little money.
@ManpreetKaur-rm2wl
@ManpreetKaur-rm2wl 3 года назад
so precise and good
@ratl0ver3
@ratl0ver3 7 лет назад
I love this. You are wonderful
@kaneezfatima926
@kaneezfatima926 3 года назад
Excellent video
@kalpanachaudhary8211
@kalpanachaudhary8211 Год назад
Thankyou so much...love your explanation :)
@prikarsartam
@prikarsartam 3 года назад
some moments I doubt in what i'm falling in for, group theory or miss Liliana​ ​de​ ​Castro! Never mind please! Thanks a lot by the way for such wonderfully brief yet precise description.
@logantheyoyoman
@logantheyoyoman 4 года назад
Awesome videos!!!
@derciferreira7211
@derciferreira7211 9 лет назад
Very good !.You dont complicate it, Can you make a vedeo about group action please.
@ewabehr4861
@ewabehr4861 3 года назад
My group theory teacher is really shitty, this video was so helpful! Now that I know what it's even about I can go and learn formal definitions and theorems
@niyathisanand
@niyathisanand 3 года назад
Thank you very much mam and good presentation 👍
@narendrakhadka9598
@narendrakhadka9598 Год назад
excellent , i really understood
@kunslipper
@kunslipper 6 лет назад
Thank you so much.
@krishanbajiya4962
@krishanbajiya4962 3 года назад
Thank you mam your videos is very helpful my study
@nallawarvijay
@nallawarvijay 3 года назад
Excellent video.... I like your explain... Tq i wish make more videos... Do you have any website??
@dzieseliezietsu3905
@dzieseliezietsu3905 2 года назад
Lol you got a new sub take this cookie 🍪 The ending got me smiling up at 4am in the morning. 😹😹
@laurentverweijen9195
@laurentverweijen9195 5 месяцев назад
Can you make a video explaining conjugency classes and the charasteristic equation?
@azhari7968
@azhari7968 2 года назад
The animation really helped
@jahirul9568
@jahirul9568 3 года назад
Thank you very much
@sandipagarwal0511
@sandipagarwal0511 6 лет назад
Perfect, what I assume about dihedral group all are truly verified here. Perfectly done
@ahmedsafiya6042
@ahmedsafiya6042 3 года назад
clear and simple.
@keepmoving5453
@keepmoving5453 6 лет назад
you are a very good teacher mam
@rxctr
@rxctr 4 года назад
Thank you !
@nazeerjehan6550
@nazeerjehan6550 3 года назад
Can you please make a video on the centre of dihedral group 🙏
@Power321ify
@Power321ify 4 года назад
2:00 For n-gon with odd number of sides, it can be seen on your diagram that there are lines of symmetries which don't go through the vertices of n-gon, but you say that the line of symmetries of n-gon are the lines through the vertices of n-gon?
@Bablu406611
@Bablu406611 5 лет назад
Please make a video in Galois theory
@twilight1176
@twilight1176 2 года назад
Just beautiful
@soroushfth7055
@soroushfth7055 3 года назад
really great
@Rsingh1
@Rsingh1 3 года назад
Veey well explained
@joshmart2569
@joshmart2569 5 лет назад
Add and solve difficult questions in your videos..... You will go far
@poulamikarmakar3759
@poulamikarmakar3759 6 лет назад
Mam ... Will you please upload some videos on nZ/Zn group... And a deep explained on it with definitions and examples... Please mam please
@edwardhartz1029
@edwardhartz1029 5 лет назад
❤️ Very good video.
@manjulacn3289
@manjulacn3289 4 года назад
Ma'am plz do videos on centralizer problems
@stuti-ruthjacob5246
@stuti-ruthjacob5246 5 лет назад
2n symmetries is due to all possible rotations and combination of rotation and flip about any 1 axis of the n sided polygon.. But it can flip about other axis too so there should be more than 2n symmetries... 🤔 Right?
@ragavanm6416
@ragavanm6416 6 лет назад
Tq mam. Very nice short lecture
@08jabbaj
@08jabbaj 6 лет назад
Thank you!!!!!
@FrankChirwa-yq1oh
@FrankChirwa-yq1oh 6 месяцев назад
Very nice
@moularaoul643
@moularaoul643 2 года назад
Thanks
@shubhradwivedi7093
@shubhradwivedi7093 7 лет назад
.....what a nice explanation !!!!!!!
@Socratica
@Socratica 7 лет назад
Thank you so much, Shubhra! We're so glad you are watching! :)
@MrVictius
@MrVictius 9 лет назад
Could you help me with figuring out how groups relate to solving polynomial equations? Specifically, can you explain Galois theory and what that has to do with the solutions of polynomial equations?
@twilightsparkle6756
@twilightsparkle6756 9 лет назад
MrVictius Polynomial equations are *closed* on the set of complex numbers, which means that any arithmetic operation used in a polynomial equation works inside the set and cannot escape it, therefore all solutions to such equation (its roots) are in this set. Now take a look at some of such equations and their solutions, and you should notice that there's a finite number of them (equal to the degree of the equation; e.g. a second-degree polynomial has two complex roots, third-degree polynomial has three etc.). And these roots are related to each other: if you take first of them and multiply by itself, you'll get the second root. Do it again, and you will get the third one. Repeating it will always give you the next root in a row. Until you make a full circle and end up where you started. Therefore they make a cyclic group. In the complex plane, they're usually located at the vertices of a regular polygon. You can do the same with any other of the roots of a polynomial. The bigger angle they make with the real axis, the more they "jump" in a rotation. E.g. if you multiply by the second root, you make twice the rotation of the first root in each step, jumping every other root. Multiplication by the third root jumps over three roots at a time. But no matter which one you choose, you always end up in one of the roots of your polynomial. No other number can be reached this way.
@reeshavchowdhury9192
@reeshavchowdhury9192 7 лет назад
great communication skill
@hearthacker5565
@hearthacker5565 4 года назад
You are amazing mam. I subscribed 😍😍
@drkevinsullivan
@drkevinsullivan 3 года назад
A Rachel Madow of group theory! (That's meant to be a nice compliment, by the way.) Nice presentation. Thanks.
@qaziarshad939
@qaziarshad939 2 года назад
How i can get all your lecture of Group theory, Real Analysis and Topology etc??????
@ThePhinista
@ThePhinista 5 лет назад
This makes good sense.
@Sahilkhan-vj8tx
@Sahilkhan-vj8tx 5 лет назад
Please give me some example of mixed group , torsion free group with examples.
@Grassmpl
@Grassmpl 2 года назад
3:58 poor lady. Needs validation and all our kindness.
@niharikadwivedi9155
@niharikadwivedi9155 Год назад
Thank you so muchh 🥰🥰🥰🥰
@donnalee3368
@donnalee3368 3 года назад
Amazing. To the point. Succinct.
@saurabhsingh-ow7ue
@saurabhsingh-ow7ue 3 года назад
thank you madam.
@govindarajkhadka8160
@govindarajkhadka8160 4 года назад
What will be the upto isomorphism of abelian group of dihedral D4 of order 8 ?
@milanpoonia7167
@milanpoonia7167 4 года назад
Mam plz make some more videos On modules
@harshitpandey7890
@harshitpandey7890 5 лет назад
This is so easy as like as galliean
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