Ring Examples (Abstract Algebra)

  Рет қаралды 247,457

Socratica

Socratica

7 жыл бұрын

Rings are one of the key structures in Abstract Algebra. In this video we give lots of examples of rings: infinite rings, finite rings, commutative rings, noncommutative rings and more!
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We recommend the following textbooks:
Dummit & Foote, Abstract Algebra 3rd Edition
amzn.to/2oOBd5S
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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Пікірлер: 251
@Socratica
@Socratica 2 жыл бұрын
Sign up to our email list to be notified when we release more Abstract Algebra content: snu.socratica.com/abstract-algebra
@naman4067
@naman4067 2 жыл бұрын
I wanted to dislike due to bad joke but video is soo good I can't
@lolo6795
@lolo6795 9 ай бұрын
@@naman4067 : clever jokes are for clever people, sorry for u.
@welovfree
@welovfree 7 жыл бұрын
Thumb up if you want Socractica to do a playlist on: Number Theory, Topology, Linear Algebra ...etc
@readingRoom100
@readingRoom100 4 жыл бұрын
just do the entire undergrad math curriculum
@hy3na739
@hy3na739 3 жыл бұрын
nice profile pic mah dud
@welovfree
@welovfree 3 жыл бұрын
@@hy3na739 fellow struggler :)
@terrellronin1370
@terrellronin1370 2 жыл бұрын
Instablaster
@Socratica
@Socratica 2 жыл бұрын
@@readingRoom100 #Goals
@digitsdigitsdigits808
@digitsdigitsdigits808 6 жыл бұрын
"This poor ring is having an identity crisis." You and me both, even-numbered matrix. You and me both.
@bonbonpony
@bonbonpony 4 жыл бұрын
What are the odds?...
@AbhishekThakur-wl1pl
@AbhishekThakur-wl1pl 3 жыл бұрын
@@bonbonpony Monoids
@omgopet
@omgopet 4 жыл бұрын
Come for the algebra lesson, stay for the puns. The delivery is amazing on both.
@swanhtet1
@swanhtet1 5 жыл бұрын
In this "Fellowship of the Ring" you are my lady Gandalf.
@fmagarik
@fmagarik 7 жыл бұрын
If you liked it then you should have put a group on it, such that it is abellian under addition, a monoid under multiplication and the distributive property holds
@maknimariem3979
@maknimariem3979 3 жыл бұрын
😂😂
@hybmnzz2658
@hybmnzz2658 3 жыл бұрын
Comment of the decade
@yogitasingh0704
@yogitasingh0704 6 жыл бұрын
An example of finite non-commutative ring is a finite MATRIX. And the way of teaching is really very wonderful, I have learnt Group Theory from your videos in my previous college semester and now in this semester, you are again making it very easy to learn Ring Theory. 🙏🙏 Thanks a lot SOCRATICA🙏 for giving us an excellent teacher🙏.... Best wishes from INDIA....🙏
@scowell
@scowell 4 жыл бұрын
Now it's time for Crypto 101! Enjoy.
@atulit
@atulit 3 жыл бұрын
same here after two years, a night before test
@nandy1002
@nandy1002 3 жыл бұрын
well if we say a finite ring with no identity and non-commutative then we can say finite even integer matrix is a ring for that
@Yami-bf6je
@Yami-bf6je Жыл бұрын
Hey i see you r an indian may i ask which college r u in
@Imakilla4567
@Imakilla4567 6 жыл бұрын
Literally laughed out loud when she said: "This poor ring is having an identity crisis". Think I've been studying too long...
@souvikbiswas284
@souvikbiswas284 3 жыл бұрын
mee too broo mee too
@__alex.grae__
@__alex.grae__ 3 жыл бұрын
Love the video. One note from a German speaker: “Zahl” is number (singular), “Zahlen” is numbers (plural), “zahlen” is pay/paying (verb).
@toasteduranium
@toasteduranium Жыл бұрын
How do the latter two differ? Capitalization only? Or pronunciation as well?
@__alex.grae__
@__alex.grae__ Жыл бұрын
"Zahlen" (numbers) and "zahlen" (to pay) are pronounced the same but keep in mind that German language will heavily conjugate verbs - English does not so much. Ich zahle, du zahlst, er/sie/es zahlt, wir zahlen, ihr zahlt, sie zahlen.
@samcollins2108
@samcollins2108 7 жыл бұрын
I loved this topic. I didn't know that rings existed in abstract algebra until now. I hope to see much move videos!
@bablidas7236
@bablidas7236 3 жыл бұрын
I never can forget the way u helped me.. These videos r really meant a lot to me... Thank u.
@sheepphic
@sheepphic 6 жыл бұрын
These are some of my favourite math videos! I've always wanted to learn abstract algebra, but it was always just a jumble of notation. Thanks for making these great videos to help people learn.
@sayy_gaarr
@sayy_gaarr 4 жыл бұрын
That smirk at the end made my day!!! She was trying so hard not to laugh.
@oldPrince22
@oldPrince22 2 жыл бұрын
How to construct a finite non-comm ring. If one uses the trick introduced in the video, one can take all 2 by 2 matrices whose entries only be 1 or 0. And addition/multiplication all usual matrix operations but under mod 2. Then (01,00)(01,10)=(10,00) but (01,10)(01,00)=(00,01) hence non-comm. Finite is obvious because we have 4 entries and each entry can be either 0 or 1 thus #
@amansingh-ww2qc
@amansingh-ww2qc 3 жыл бұрын
Amazing , with these small powerful videos filled with concept I learn everything
@Omnifarious0
@Omnifarious0 4 жыл бұрын
Your bad puns, so carefully and thoughtfully delivered are amazing. I couldn't do better myself, and that's saying something (specifically, that I couldn't do better myself).
@escobasingracia962
@escobasingracia962 7 жыл бұрын
I love all this videos. This is the kind of math that I really enjoy and it's explained in an excellent way.
@rcarnes3
@rcarnes3 6 жыл бұрын
Yep. I'm now a Patreon contributor. Excellent presentation.
@Fematika
@Fematika 7 жыл бұрын
Love this series!
@tinahayward1604
@tinahayward1604 2 жыл бұрын
This was fantastic! Thank you so much!!!! I think you may save me this semester
@roadtofitness4208
@roadtofitness4208 6 жыл бұрын
Mam your vedios are very helpful Thanx a lot mam Lots of well wishes from india
@Fematika
@Fematika 7 жыл бұрын
Do the n x n matrices mod(n), meaning ((a mod(n), b mod(n)), (c mod(n), d mod(n))), with all of the usual operations, though each element is now mod(n).
@Fematika
@Fematika 7 жыл бұрын
For a non commutative, finite ring.
@hutchisblind
@hutchisblind 7 жыл бұрын
Yes.
@greghmn
@greghmn 5 жыл бұрын
By that token, you can also come up with a non-commutative finite rng (my way of notating the lack of mult id), like nxn matrices with entries that are elements of xZ/yZ, where x divides y, x
@Sam-py9qq
@Sam-py9qq 4 жыл бұрын
If anyone finds it unclear, this ring is finite because it contains (only) the matrices with elements ∊ ℤ (mod n), and closed because the elements of any product or sum thereof reduce to ℤ (mod n). Specifically, the order of this ring (in the "size of set" sense) is n^(n·n) since there are n variants for every n·n position ⇒ n^(n·n) total variants.
@MatematicasNuevoLeon
@MatematicasNuevoLeon 7 жыл бұрын
Beautiful videos. One cannot avoid falling in love with math.
@Lacerda038
@Lacerda038 5 жыл бұрын
Muito bom! Continue com essas lições! Obrigado!
@sujitmohanty1
@sujitmohanty1 6 жыл бұрын
Indeed fantastic series!
@muh.khairulamtsal1635
@muh.khairulamtsal1635 Жыл бұрын
just found this channel, really intersting and decent way of teaching love ur video sm
@Socratica
@Socratica Жыл бұрын
We're so glad you've found us! 💜🦉
@ashishswami7188
@ashishswami7188 7 жыл бұрын
your videos are absolutely fabulous..
@zaidnadeem4918
@zaidnadeem4918 3 жыл бұрын
MASHALLAH. THE WAY OF TEACHING IS VERY GOOD. 👍👍👍👍 MAY ALLAH BLESS YOU
@MdShahid-fx2iw
@MdShahid-fx2iw 4 жыл бұрын
Your lecture is so helpful mam!
@chandrakalachauhan470
@chandrakalachauhan470 2 жыл бұрын
Incredible, way of teaching Thankyou so much
@kunslipper
@kunslipper 6 жыл бұрын
Thank you so much.
@zahidrafiq2943
@zahidrafiq2943 3 жыл бұрын
Lec are so simple every one can understand easily thank u for making videos
@jeannymath6349
@jeannymath6349 6 жыл бұрын
very helpful. Thank you
@cuntyclown
@cuntyclown Жыл бұрын
Ma'am you are an icon and a legend. Thank you !!
@hectorblandin1027
@hectorblandin1027 11 ай бұрын
Love your content !
@humletnobel7792
@humletnobel7792 8 ай бұрын
What a brilliant explaining 😊
@Belmogaming6002
@Belmogaming6002 4 жыл бұрын
Thank you for best in world classes 😃
@victoralejadromc
@victoralejadromc 2 жыл бұрын
Great videos!
@theflaggeddragon9472
@theflaggeddragon9472 7 жыл бұрын
Can you please do more videos on congruence arithmetic including the euclidean algorithm?
@kingprogramming
@kingprogramming 5 жыл бұрын
Great video!!!
@IjazKhan-fm4si
@IjazKhan-fm4si 3 жыл бұрын
Great work
@Headon2580
@Headon2580 4 ай бұрын
your teaching technique is so good i like it .thanks❤❤❤❤👍👍
@theultimatereductionist7592
@theultimatereductionist7592 5 жыл бұрын
6:27 Wedderburn's Theorem: there are no finite noncommutative division rings (rings all of whose nonzero elements have multiplicative inverses). But finite noncommutative non-division rings: matrices over a Z/n with n composite might work.
@theultimatereductionist7592
@theultimatereductionist7592 5 жыл бұрын
Don't even need n to be composite. The 16-member ring of all 2-by-2 matrices over Z/2 is noncommutative: M = 1 in all entries except 0 in (1,2) N = 1 in all entries except 0 in (2,1) MN = 1 in all entries except 0 in (2,2) NM =1 in all entries except 0 in (1,1) The 4 matrices with 0s in all entries except 1 in one entry have no inverse.
@radhaballavnandi3155
@radhaballavnandi3155 4 жыл бұрын
your lectures are amazing maa'm
@Khazam1992
@Khazam1992 5 жыл бұрын
I like how the background theme song changed when you start introducing the fields :)
@eringreene9482
@eringreene9482 4 жыл бұрын
Example of a finite noncommutative ring, maybe The set of 2x2 Matrices where the entries are from The integers mod n (Z/nZ)
@javiervera6318
@javiervera6318 4 жыл бұрын
That has identity Since 1 belongs to Z/nZ. So te matrix with 1 in the diagonal belongs to that set
@johnb1391
@johnb1391 4 жыл бұрын
​ Javier Vera What about the zero matrix? It's determinant is zero so it does not have an inverse matrix (so no identity since A^-1 does not exist).
@dkprasad100
@dkprasad100 4 жыл бұрын
that answer is correct. That ring is denoted by M[Zn] which has finite number of elements and non-commutative under matrix multiplication. It is Abelian under matrix addition and thus a ring.
@eringreene9482
@eringreene9482 4 жыл бұрын
John B remember that in a ring, there doesn’t neccesarily need to be multiplicative inverses.
@ACZ29
@ACZ29 7 жыл бұрын
it's awsome explanation mam......
@macmos1
@macmos1 6 жыл бұрын
The quotient group Z/nZ should be Z/nZ = { [0], [1], [2],..., [n-1] }, where [a] = a + nZ is an equivalence class.
@LocNguyenCrypto
@LocNguyenCrypto 6 жыл бұрын
So, we need a finite set of elements and matrix. We can limited a set by using { module, char, int, etc in computer science, other set } Is there a way for not using matrix?
@muzafarhussain6878
@muzafarhussain6878 4 жыл бұрын
One of my best teacher ..Socratica . Love from pakistan .. keeping it up ,so that we learn easly ..🇵🇰🇵🇰
@kavithamicheal9821
@kavithamicheal9821 5 жыл бұрын
Really it's understandable. Tq mam.
@karthikkrishnan6717
@karthikkrishnan6717 2 жыл бұрын
Nice one
@valor36az
@valor36az 4 жыл бұрын
So many questions I had explained in under 8 minutes
@JoelBondurant
@JoelBondurant 7 жыл бұрын
I paypaled $20, ♥💕 your content.
@Socratica
@Socratica 7 жыл бұрын
Oh my goodness, thank you so much, Joel!! We're so glad you enjoy our videos, and are very humbled by your support. :)
@abdullahtrabulsiah3603
@abdullahtrabulsiah3603 2 жыл бұрын
Thank you
@desalewtefera1128
@desalewtefera1128 6 жыл бұрын
Really nice
@cameronspalding9792
@cameronspalding9792 3 жыл бұрын
An example of a finite non commutative ring is the set of matrices with elements in Z3
@oneandonly66
@oneandonly66 6 жыл бұрын
thank u very much mam ...
@marklusala8397
@marklusala8397 3 жыл бұрын
Thanks for the video, How can i find the inverse of (1,2) over the ring R = Z5?
@sreejaps2428
@sreejaps2428 6 жыл бұрын
Mam pls make a video on ideal rings
@ronycb7168
@ronycb7168 Жыл бұрын
Like the shirt like nice color hoping to see some division ring examples too cuz vector spaces right ▶️
@naveenbabu3689
@naveenbabu3689 6 жыл бұрын
Very useful
@tauamatuatabuanaba3125
@tauamatuatabuanaba3125 8 ай бұрын
Don't worry I have already joined the fellowship of the Ring😆 since childhood, thank you for your wonderful explanation...
@geogeo14000
@geogeo14000 3 жыл бұрын
Great video as always, but a ring A can existe without identity element "1_A" ? because when I read the definitions given on french website and in my french course, the present of 1_A an identity element is required, same for sub-rings
@noellundstrom7447
@noellundstrom7447 6 жыл бұрын
My answer for the final question would be a ring consisting of the 2x2 matrices where all the elements of the matrix are the integers mod n. The ring would be commutative under addition from the definition of a matrix and because the integers mod n also being commutative. And of course matrix multiplication is non-commutative. Am I right?
@ajayganta4778
@ajayganta4778 6 жыл бұрын
madam please send a video on ideals
@nowornever5598
@nowornever5598 5 жыл бұрын
Thanks
@objective_truth
@objective_truth 4 жыл бұрын
In fact, every ring is a group, and every field is a ring. A ring is a group with an additional operation, where the second operation is associative and the distributive properties make the two operations "compatible". A field is a ring such that the second operation also satisfies all the group properties (after throwing out the additive identity); i.e. it has multiplicative inverses, multiplicative identity, and is commutative. In mathematics, a ring is one of the fundamental algebraic structures used in abstract algebra. It consists of a set equipped with two binary operations that generalize the arithmetic operations of addition and multiplication. Through this generalization, theorems from arithmetic are extended to non-numerical objects such as polynomials, series, matrices and functions. A ring is an abelian group with a second binary operation that is associative, is distributive over the abelian group operation, and has an identity element (this last property is not required by some authors, see § Notes on the definition). By extension from the integers, the abelian group operation is called addition and the second binary operation is called multiplication.
@BareClause
@BareClause 3 жыл бұрын
A ring is an abelian group and a monoid such that the monoid operation distributes over the group operation
@sartajmuzafer9636
@sartajmuzafer9636 2 жыл бұрын
Wonderful.. ❤️❤️❤️
@ujjalboro5127
@ujjalboro5127 3 жыл бұрын
I CAN LEARN ABSTRACT ALGEBRA ONLY FROM SOCRATICA. THANK YOU SO MUCH SOCRATICA.
@Socratica
@Socratica 3 жыл бұрын
We're so glad you're watching with us!! It really inspires us to make more videos when we hear that we're helping. 💜🦉
@ATD909
@ATD909 4 жыл бұрын
This video is well done I’m studying for my math teacher’s exam in California that I’m taking in 12 hours
@brouqtv6388
@brouqtv6388 5 жыл бұрын
Fantastic
@SuperStingray
@SuperStingray 6 жыл бұрын
Unit quaternions with integer coefficients.
@nolanhauck9390
@nolanhauck9390 2 жыл бұрын
Good video
@saurabhsingh-ow7ue
@saurabhsingh-ow7ue 3 жыл бұрын
thank you madam...........
@aoungorayaa7459
@aoungorayaa7459 5 жыл бұрын
thanx for giving knowledge. from which country you belong kindly tell me i really impress from your lectures
@seroujghazarian6343
@seroujghazarian6343 Жыл бұрын
N->regular set Z->(commutative) ring Q->field R->field C->field
@elizabethcornell5745
@elizabethcornell5745 6 жыл бұрын
I love you too much u just saved me
@ayushkumaryadav8934
@ayushkumaryadav8934 6 жыл бұрын
Please describe division ring
@MrityunjaySinghVictor
@MrityunjaySinghVictor 4 жыл бұрын
A non commutative finite ring is set of matriex whoes elements is from Z/nZ ( for every n is element of Z)
@elnurazhalieva1262
@elnurazhalieva1262 5 жыл бұрын
Hmm, finite noncommutative ring? What about ring of matrices whose elements are from set Z/nZ?
@ZiggyNorton
@ZiggyNorton 5 жыл бұрын
That's what I believe as well. Since matrices are non-commutative, regardless of the entries, they will be non-commutative. Since the integers mod n is finite, there is a finite number of matrices with entries from this set.
@elnurazhalieva1262
@elnurazhalieva1262 5 жыл бұрын
@@ZiggyNorton Yeah, absolutely
@chetanpatidar3900
@chetanpatidar3900 3 жыл бұрын
Yes that's right
@llhammer3075
@llhammer3075 3 жыл бұрын
you've blown my mind
@riyaagrawal269
@riyaagrawal269 6 жыл бұрын
reallyy mam.. u r suprb..😄😄..
@rngwrldngnr
@rngwrldngnr 5 жыл бұрын
5:35 if the integers mod (some prime) is a field, wouldn't that require there to be a multiplicative inverse for 0?
@MuffinsAPlenty
@MuffinsAPlenty 5 жыл бұрын
No. A field is a ring in which every _nonzero_ element has a multiplicative inverse. The axioms of a ring (namely, an Abelian group under addition and distribution of multiplication over addition) _forces_ 0 to multiply every ring element to 0. As such, it is _impossible_ for zero to have a multiplicative inverse (except in the fairly stupid case where 0 = 1). Therefore, the best you can do for multiplicative inverses is to have every _nonzero_ element have a multiplicative inverse. So that is the requirement to have a field/division ring.
@RedefiningtheConcepts
@RedefiningtheConcepts 6 жыл бұрын
Excellent.I want the videos on Linear Algebra is it possible
@patrickcrosby3824
@patrickcrosby3824 5 жыл бұрын
In the mean time, check out some videos on the subject by Gilbert Strang here on youtube.
@TheGamgeen
@TheGamgeen 5 жыл бұрын
Please give me video of product of two rings
@ilguerrierodragone129
@ilguerrierodragone129 6 ай бұрын
Proud to join the fellowship of the ring
@naman.sharma1
@naman.sharma1 4 жыл бұрын
I learned all about algebra and what my Ma'am wants to tell. Thanks
@jean-francoistremblay7744
@jean-francoistremblay7744 3 жыл бұрын
Just for the fellowship of the ring, I give 2 thumbs up!!!!
@Stafford674
@Stafford674 4 жыл бұрын
Once we have established the definitions of various types of ring, is there anything else that can be said about them. Do all commutative finite rings have some property in common. If so, what is it? If not, what is the point of all this?
@muhammadshafqat1935
@muhammadshafqat1935 2 жыл бұрын
In integer mod n ring how can we check inverse w.r.t addition property?
@bonbonpony
@bonbonpony 4 жыл бұрын
05:12 Can you talk some more about those ideals? I don't see them being introduced anywhere on this playlist. 06:46 Dying inside a little bit when reading that from the prompter there, eh? :) OK, I guess that the 2×2 matrices with coefficients being integers mod n is the non-commutative finite ring we're looking for?
@karthikaa2411
@karthikaa2411 6 жыл бұрын
how to find cayley table is associative
@asishkhamrui8685
@asishkhamrui8685 6 жыл бұрын
Mam you help to solve some problem in ring theory?????
@awaisjamil6349
@awaisjamil6349 4 жыл бұрын
Set of all nxn matrices over a finite field whose bootom row is zero is a finite non commutative ring
@neuronclasses1415
@neuronclasses1415 2 жыл бұрын
Plz....explain mam The set of all continuous real-valued functions of a real variable whose graphs pass through the point (1,0) is a commutative ring without unity without unity under the operations of pointwise addition and multiplication, i.e., the operations (f+g)(a) = f(a)+g(a) and (fg)(a)=f(a)g(a)
@kavitha.s3863
@kavitha.s3863 3 жыл бұрын
Awesome mam
@ericdew2021
@ericdew2021 4 жыл бұрын
Any chance of getting to algebraic topology?
@antoniovieira388
@antoniovieira388 5 ай бұрын
Estou de queixo caido com voce Liliana Castro !!!!!!
@worldboy9684
@worldboy9684 2 жыл бұрын
Thanks!
@worldboy9684
@worldboy9684 2 жыл бұрын
Thanks for introducing me to abstract algebra, loving it, its great :D
@Socratica
@Socratica 2 жыл бұрын
Oh my goodness, THANK YOU so much for your kind support! We're so glad you're enjoying learning about AA - it's really our fondest hope to help people enjoy learning more. 💜🦉
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