(2,2,4) Btw. These are the best videos ever. As soon as I become a data scientist I won't forget who helped me!
@KCIsMe4 жыл бұрын
How does group theory help with data science (just curious, cause I'm interested in both but didn't realize they relate)?
@LastvanLichtenGlorie4 жыл бұрын
Karan Chopra Symmetries are a central concept in understanding the laws of nature, it is widely used in physics, mathematics, chemistry and machine learning. an example of group symmetry being used in machine learning is Convolutional Neural Networks also known as space invariant artificial neural networks (SIANN). Mathematically, it is technically a sliding dot product or cross-correlation. This has significance for the indices in the matrix, in that it affects how weight is determined at a specific index point. Of course as soon as we are in the realm of matrices and linear algebra we are already being governed in many aspects by abstract algebraic structures and group theory.
@geogeo140004 жыл бұрын
same for me
@chymoney13 жыл бұрын
@@LastvanLichtenGlorie translation invariance is cool but I feel like topological data analysis is much more of a direct application. At least from what I’ve seen
@azhari79682 жыл бұрын
I don't think it's necessary to study this topic to become a data scientist
@ninosawbrzostowiecki18927 жыл бұрын
This video is awesome! Please do one on Sylow's theorems.
@coldblaze1005 жыл бұрын
I can't wait for my baby niece to grow up and ace all her stem courses because Socratica exists
@ecowithsudheer55473 жыл бұрын
You're awesome
@almustaphaumar2904 Жыл бұрын
I hope this message finds you well. I wanted to take a moment to express my sincere gratitude for the exceptional lecture video you created. Your dedication to delivering valuable content and sharing your knowledge has not gone unnoticed, and I am truly thankful for the opportunity to learn from your video. Your lecture was not only informative but also engaging and well-structured. The way you explained complex concepts with clarity and enthusiasm made the subject matter more accessible and enjoyable to grasp. Your expertise and passion for the topic shone through, making it a truly enlightening experience for me. As a learner, I value educational resources that inspire and empower, and your video certainly did just that. Your commitment to fostering a deeper understanding of the subject is truly commendable. Once again, thank you for your time and effort in creating such a valuable educational resource. Your dedication to sharing knowledge has undoubtedly made a positive impact on my learning journey. I look forward to exploring more of your content in the future. With utmost appreciation,
@Socratica Жыл бұрын
What a cheering message to read. Thank you for your kind thoughts. We're so glad you've found us! 💜🦉
@m06prc5 жыл бұрын
I binge watched 20 of her abstract algebra videos. It is just that good.
@thematt53257 жыл бұрын
I had no idea what you were talking about but here's a thumbs up anyway.
@parimuffins4 жыл бұрын
You are an angel on Earth. You have no idea how many lives you're changing!
@RAJSINGH-of9iy2 жыл бұрын
At 4:55, ans is (2,2,4)
@PunmasterSTP3 жыл бұрын
Amazing videos! I think I've already watched ~8 so far this morning, and I have no plans of stopping!
@bencrossley6476 жыл бұрын
Due to a change of course I'm trying to study Abstract Algebra without having done the pre-module Geometry and Groups. These videos are a godsend. Oh and due to my strange course through university, I've already got a 1st in Vector Spaces, a pre-requisite of which is Abstract Algebra.
@sanjityadav37722 жыл бұрын
The rate at which videos are made here is direct product of subscribers, no. of viewers and Patreon supporters. Mathematical way!!!! Yeah!!! Loved the presentation...
@markmathman6 жыл бұрын
An infinite product of trivial groups is a trivial group. This was overlooked (time mark 5:37 out of 8:54).
@SanjayRay-dp4vs12 күн бұрын
Thanks!
@Socratica11 күн бұрын
Thank you so much for your kind support! We so love making these videos. 💜🦉
@amitakar96202 жыл бұрын
Thank you for making this video brief . It helped me to learn the concept . ❤️. Take love from INDIA 🇮🇳
@guilhemescudero91145 жыл бұрын
4:56 : two inverses : (-1, -3, -2) or (2, 2, 4)
@MuffinsAPlenty5 жыл бұрын
In the group you're speaking of, (-1, -3, -2) = (2, 2, 4). :)
@badhbhchadh5 жыл бұрын
If you do it like that, you have infinitely many, but they are all identical.
@jonmolina9485 жыл бұрын
I think you're forgetting (8, 7, 10) and (-7, -13, -14). She might as well give the short lecture on equivalence classes.
@guilhemescudero91145 жыл бұрын
@@MuffinsAPlenty yes it was implicit in my mind, I should have written this ;)
@guilhemescudero91145 жыл бұрын
@@jonmolina948 ((8,7,10) is the same as ( (2 = 8 / 3ℤ), (2 = 7 / 5ℤ), (4 = 10 / 6ℤ) ) so it seems that: ( (2 ≣ 2 + 3ℤ), (2 ≣ 2 + 5ℤ), (4 ≣ 4 + 6ℤ) ) then we can write ( ( (k ≣ k + 3ℤ), (l ≣ l + 5ℤ), (m ≣ m + 6ℤ) ) with k, l, m ∈ ℤ . So all the inverses of (1, 3, 2) can be written as ( (2 + 3ℤ), ( 2 + 5ℤ), ( 4 + 6ℤ ) ) isn't it? What are equivalence classes?
@Fatim15leo7 жыл бұрын
hey, I loved these series of videos on Group theory as we were generally told that its one of the most complex subjects but you have put it up really nicely.
@categorygrp6 жыл бұрын
You should do a video on semi-direct products.
@rayrocher68877 жыл бұрын
this was an interesting and very well organized math lesson. thank you for the encouragement.
@huttarl2 жыл бұрын
At 5:37 the video says that if you take the direct product of an infinite number of finite groups, you get an infinite group. Surely this is only the case if an infinite number of those groups are non-trivial? Maybe that goes without saying, but I wanted to check. For example, if you took the direct product of the integers mod 3, with an infinite number of groups of order 1, you would get a group of order 3, right? Not an infinite group.
@MuffinsAPlenty2 жыл бұрын
You are correct.
@saiganeshreddy72357 жыл бұрын
It would be lot useful if u even add the references at the end or beginning of the video ,content is elegantly explained in such short amount of time ,It would be lot useful if u can update videos on advance tops as well (ex:topology ,complex anylisis,real anylisis,number theory etc) .any way thanks alot it really helped me a lot to find the missing dots of my understanding in abstract algebra .
@sanan225 жыл бұрын
I wish I had a teacher like you back 25 years ago when I was in my pre-teens and in love with mathematics. it could've changed my life. bad teachers year after year had me lose interest
@jonm82184 жыл бұрын
let's not she's not alone in making this. Michael Harrison and Kimberly Hatch Harrison also worked on this too.
@rollbacked2 жыл бұрын
this channel is my hero
@francceD Жыл бұрын
Pleaseeee more abstract algebra videos!! There are not enough videos and you make the best videos everrr!!!❤ you explain everything so perfect , i love u ❤❤
@jpphoton7 жыл бұрын
Getting back to brass tacks. Awesome.
@ScilexGuitar5 жыл бұрын
4:55 Is it (2,2,4)?
@alberttresvilanova69535 жыл бұрын
for a sec i thought it was (3,3,5) but we're using addition so e=0 and not 1 silly me!
@durastory19284 жыл бұрын
True
@elielx24 жыл бұрын
"At Socratica the rate at which we make videos is a *direct product* of views, subscribers and Patreon supporters"
@Grassmpl3 жыл бұрын
She's lying. They intersect at the staff and equipment non-trivially so the product is internal and not direct.
@יעקבמישייב5 ай бұрын
Im study masters degree as Electrical Egeneer and I have a course "deep learning and groups(groups, representation on groups, equivarints, symmetries) you just saved mee
@AdityaKumar-bv3hq7 ай бұрын
Wow, fantastic explanation
@utomato11476 жыл бұрын
I feel like I was learning linguistic or grammar things! Interesting! Thank you!
@RurczakKurczak3 жыл бұрын
5:30 if we take a product of infinite trivial groups we get a trivial group, which is finite. So this statement is not always true.
@avishkadhananjaya69646 жыл бұрын
these are the best videos ever...thank you for that
@DanaLea577 жыл бұрын
I'm confused. at 6:05(ish) you said a=(2,3) and b=(1,2)... don't all members of Sn have three parts? Where's the one in a and the three in b? And you multiplied two 2-tuples and got a 3-tuple, how's that work?
@kellyepperson61687 жыл бұрын
@Dana Hill Yes, All members of Sn have 3 parts. The example uses something called "cycle notation." A couple of good youtubes on that - but in short the notation just follows where the number goes as you cycle through the elements in the parenthesis and then back to the first element. In other words [ a = (2 3) ] means a permutation where 2 goes to 3, 3 goes back to 2 with 1 staying fixed. b = (1 2) means 1 goes to 2 and 2 goes back to 1 while 3 stays fixed. So doing multiplication or rather the composition of a*b we just determine where a number ends up. So let's start with 1 in Sn =(1 ? ?) and then the second element (?) is where we end up. Do b = (1 2) first, so (1 goes to 2) and then to see where 2 goes we look at a = (2 3) and see (2 goes to 3) so a*b takes 1 to 3. In cycle notation we write 1 goes to 3 as (1 3 ?). Now let's see where 3 goes? b (3 stays fixed) and then a (3 goes to 2) so a*b takes 3 to 2 and we write that in the final as (1 3 2) -- (1 goes to 3 goes to 2) Now for b*a (1 ? ? ): a leaves 1 fixed and b takes 1 to 2, so b*a takes 1 to 2 = (1 2 ?). then for the final element a takes 2 to 3 and b leaves 3 fixed so b*a takes 2 to 3, so we write (1 2 3) - (1 goes to 2 goes to 3)
@DanaLea577 жыл бұрын
ok
@missingno96 жыл бұрын
Thanks for that! Maybe they should have a note about that, maybe a link to another video about it.
@RoyalH3iR6 жыл бұрын
a keeps 1 fixed so it is omitted and b keeps 3 fixed so it is also omitted in o/w it would be a=(23)(1), b=(12)(3)
@avishkadhananjaya69646 жыл бұрын
thank you for this thing
@vaskoalph16483 жыл бұрын
Love from India you are great teacher ❤️
@labmusqooraf54066 жыл бұрын
your method of teaching is amazing.. keep it up
@hasanaljamea25695 жыл бұрын
well explained 👍. can't wait for semi-direct product. so excited!
@fahrenheit2101 Жыл бұрын
Another well explained video. Though I will say, a lot of this felt rather trivial, until the casual mention of that theorem at the end...
@1729STUDYPOINT Жыл бұрын
It's very helpful, 💯 Thank you... Additional ! I wish, I're also speak fluent English like you...
@markmathman6 жыл бұрын
The elements of the quotient group Z/3Z and of Z sub 3 are confused (time mark 4:38)
@arbsieyasin41273 жыл бұрын
You are always special and make topics friendly!!!
@kz.06812 жыл бұрын
THIS VIDEO IS AWESOME.THANK YOU!
@Kisnaram_r_j4 жыл бұрын
It's an absolutely way to teach us and made us more effectively
@Socratica3 жыл бұрын
Sign up to our email list to be notified when we release more Abstract Algebra content: snu.socratica.com/abstract-algebra
@mathsacademy4174 Жыл бұрын
well explained
@shravandanga14035 жыл бұрын
Awesome. Best way to define the product of two groups and their properties. Thank you.
@Grassmpl3 жыл бұрын
"Direct" product. There are other kinds of products, like free products, and tensor products, semidirect product.
@amritathakur203610 ай бұрын
Plz make more videos on EDP and complete modern algebra
@poulamikarmakar37596 жыл бұрын
Make some vdos on external and internal direct product of group... ?? And what's the difference between them ?? Pls reply
@alishasahraribaarisha47405 жыл бұрын
Ingeneral these are same
@maryamsaeed36334 жыл бұрын
This is such a precise explanation. Thank you mam
@MarkLares Жыл бұрын
Can you help explain how you did the multiplication at time 6:11 (or point me to where it is explained)
@paominlienguite23975 жыл бұрын
Your explaination is sooo simple I like it and can understand it very much thank you Ma'am.
@Matchless_gift6 жыл бұрын
Helpful as always
@munirahabdullah65422 жыл бұрын
Thank u so much can you explain the Fundamental Theorem of Finite Abelian Groups
@AbhishekSingh-mh4vk3 жыл бұрын
this is very helpful video.....thankyou so much
@markmathman6 жыл бұрын
Great videos!
@簡昱睿-n2x7 жыл бұрын
Can you talk about semi-direct product? plz
@sureshmathemetics66966 жыл бұрын
I love ur teaching
@dhruvprajapati90363 жыл бұрын
This is the best video
@sandeepkumarvermaau37417 жыл бұрын
Nice job keep it up
@sarojpadhy55354 жыл бұрын
Thank u very much for ur contribution for us mam.u have just package of knowledge with good communication skill that directly touch my heart and it makes me productive.
@bobbiemarkwick44177 жыл бұрын
Exception to infinite number of finite groups: if all but a finite number of groups are the trivial group of the identity.
@GelidGanef7 жыл бұрын
So when we say you can factor groups like you can factor numbers into primes... What we're really saying is that there exist an infinite number of unique groups, defined as the powers of some prime under multiplication. And that the direct product of this infinite number of groups is isomorphic to the rationals under multiplication.
@HDQuote5 жыл бұрын
this video reminds me of PBS Infinite series 🤔
@hafizajiaziz87734 жыл бұрын
But it's more technical.
@jayashree.j17776 жыл бұрын
plz explain in detail... how a set transforms to a space & space to metric space with examples?
@macmos17 жыл бұрын
Great video.
@Bharat_Rohan9 ай бұрын
8:03 simpler groups mean referring to cyclic groups not simple groups right!
4 жыл бұрын
5:30 Technically if you took a direct product of a finite number of finite groups and infinite number of groups of order 1 (with just a single element, namely identity element) you'd still get a finite group, right? I know it's a corner case but still :D
@markmathman6 жыл бұрын
The curly braces are incorrectly positioned (time mark 3:23 out of 8:54).
@tarigmergani39035 жыл бұрын
is all professor explain the way you do then only few would dislike math
@kunslipper7 жыл бұрын
Thank you so much.
@shelymutiaramaghfira4 жыл бұрын
Thankyouuuu so much!!! 🙏🏻😍❤❤
@bigstroker1300 Жыл бұрын
Which are the ways to piece together groups other than the direct product? i could not find those ways anywhere.
@mahanthivenkataramana1573 жыл бұрын
Ecxellent lecture
@dipsacedemy3 жыл бұрын
You are great dear mathematician.. i wish to see some more topics in group theory like solvable group's , nilpotent group , normal series's and even module or galois theory too and we can make algebra playlist to more big
@Grassmpl3 жыл бұрын
It's galois theory
@dipsacedemy3 жыл бұрын
@@Grassmpl yeah that what i mean. Thanks for correcting mine typo.
@ahnekah52613 жыл бұрын
@3:11, what's the answer?
@phyziks8783 жыл бұрын
(12 , -I) inv (-12 , i)
@cameronspalding97923 жыл бұрын
Can I ask: if you break up a group into simple groups using the Jordan Holder theorem, how do you recombine them to get back to the original group
@bloody_fool6 жыл бұрын
8:41 So what is the inverse of a patron?
@badhbhchadh5 жыл бұрын
What even is the operation on the group?
@sirluoyi28532 жыл бұрын
Done!
@lipshabhoi63007 жыл бұрын
Hey ur all videoes r vry useful to understand can u explain product of 2 subgroups i really need this plz
@vangelisrocks2 жыл бұрын
thank you
@nowornever55985 жыл бұрын
Thanks
@amaarquadri3 жыл бұрын
5:37 "If you take the direct product of infinitely many finite groups, you get an infinite group." Doesn't this also require that infinitely many of those groups are not the trivial group? Otherwise, you could just multiply the trivial group by itself and end up with a group that just has 1 element.
@MuffinsAPlenty3 жыл бұрын
Yes, you need infinitely many groups to be nontrivial.
@saurabhsingh-ow7ue4 жыл бұрын
thank you madam.....
@mrgd78137 жыл бұрын
you re wonderful. thank u thank u thank u..
@SwrwngThai6 жыл бұрын
I love the music ......
@mehulkumar34694 жыл бұрын
When you take the direct product of integer mod (3×5×6) the order of the direct product should be lcm of all groups combined since all groups are cyclic hence i think the order of G must be 30 instead of 90 correct me if I am wrong
@descuddlebat4 жыл бұрын
This would be true if it were (n mod 3, n mod 5, n mod 6) for the same n, but that is not a requirement. As it is, your choices for each element are independent - you have 3 choices for first element to be an integer mod 3, and similarly 5 choices for second element and 6 for third, leaving you with 3x5x6 = 90 total choices
@descuddlebat4 жыл бұрын
That said, I believe (n mod 3, n mod 5, n mod 6) would form a normal subgroup of 30 elements with cosets (n mod 3, n mod 5, (n+1) mod 6) and (n mod 3, n mod 5, (n+2) mod 6), and these three sets would form a quotient group, so your idea with employing lcm actually says something new about the group!
@mehulkumar34694 жыл бұрын
Thank you so much now i understand the concept.
@Grassmpl3 жыл бұрын
Oh you are definitely wrong. We identify each direct factor independently with the canonical image of any 2 of them having a trivial intersection.
@khushisang57444 жыл бұрын
Answers of the questions are =>Inverse of (12,i) is (1,-i) =>No, every element doesn't have an inverse =>Associative property hold for this example M i right.. If no then tell me the true one
@descuddlebat4 жыл бұрын
Inspired by a comment about introducing lcm: I believe (n mod 3, n mod 5, n mod 6) for the same n would form a normal subgroup of 30 elements with cosets (n mod 3, n mod 5, (n+1) mod 6) and (n mod 3, n mod 5, (n+2) mod 6), and these three sets would form a quotient group, so that would say something new about the group Z/3Z x Z/5Z x Z/6Z, would that be right?
@AQWraghd995 жыл бұрын
thanks! really helpful:)
@phooiseanchong14737 жыл бұрын
It is really amazing video and I have learnt a lot. However, I have a question regarding the direct product of real numbers and symmetry group S3, why the a=(2 3) and b=(1 2) can operate under the multiplication of symmetry group S3 since it contain two elements inside a and b which is different from the previous symmetry group video that contain 3 elements? Thank you very much and I love Socratica video so much! Hope can come out more Abstract linear algebra video ! :)
@kellyepperson61687 жыл бұрын
@Chong (tried to explain one way to Dana Hill above will try another way with you - hopefully you both see and at least one makes sense to either one - maybe both :)) a = (2 3) is cycle notation and just means element 2 goes to element 3, element 3 loops back to element 2, and element 1 stays fixed. So (x y z) would go to (x z y) or using numbers (1 2 3) goes to (1 3 2) b = (1 2) means 1 goes to 2, 2 goes back to 1 and 3 stays fixed. (x y z) goes to (y x z) or (1 2 3) goes to (2 1 3) a*b means b first (x y z) goes to (y x z) then a takes (y x z) to (y z x) or (xyz) goes to (yzx) which if we write that in cycle notation (1 3 2) = element 1 goes to element 3, element 3 goes to element 2, element 2 goes to element 1 b*a means a first (x y z) goes to (x z y), then b takes (x z y) to (z x y) or (xyz) goes to (zxy). In cycle notation (1 2 3) Again the (2 3) and (1 2) are not elements of the Sn group, just a way to write how the permutation happens - what it does. Just like the products (1 2 3) and (1 3 2) are not elements of Sn but are just how the permutation happens (1 2 3) = element 1 moves to the element 2 spot, element 2 moves to the element 3 spot and the element 3 spot loops back to the element 1 spot.
@bhagabansharma54335 жыл бұрын
The product of (2 3)and (1 2) is nothing but the product of two cycle
@maikellaishram74843 жыл бұрын
Subgroups of Z+Z(external direct product) ???
@michaellangan59916 жыл бұрын
You say there are no restrictions on the groups, but do they both have to be the same multiplication? For instance can G1 be mod20 and G2 = mod3?
@michaellangan59916 жыл бұрын
Asked before I finished the video... So, to answer my own question... No, there can be different group operations when using the direct product :) Great videos, thank you!!!!!
@zakirullahbzt4 жыл бұрын
Okay mam can you tell us Cn×Cm is isomorphic to Cnm
@mathonline60134 жыл бұрын
Mam will you find direct product product of A3 and S3 ? For me
@مهندعايد-ز8ذ7 жыл бұрын
i want ask about the weak direct product I need to help thank you
@randomcat52623 жыл бұрын
this is the direct product of a lot of mathematical thinking
@Grassmpl3 жыл бұрын
Kind of trivial if you ask me. It depends on which groups are your mathematical thinking isomorphic to.
@vanguard76747 жыл бұрын
Amazing.
@eddy15376 жыл бұрын
I don't get it. Lets say we have two groups A = { Z/2 (integers mod 2) } and B = { Z/4 (integers mod 4) }. The groups have different order |A| = 2 and |B| = 4 so if we calculate C = A x B, C would have order 8, but what would the elements of C be? Step by step answer would be appreciated :)
Answers of the questions are =>Inverse of (12,i) is (1,-i) =>Yes every element have an inverse =>Associative property hold for this example M i right.. If no then tell me the true one
@cameronmyron57763 жыл бұрын
Yes to 2 and 3, no to the first. The inverse of the element (12,i) in the group of the integers under addition X {1,-1,i,-i} under multiplication is (-12,-i) because 12+(-12)=0 and i*(-i)=1 (and the identity element is (0,1)). (12,i)*(1,-i)=(13,1) not (0,1).
@jayashree.j17776 жыл бұрын
extremely useful... tq so much... can u plz upload real analysis videos too? i wil b really useful plz plz plz
@Grassmpl3 жыл бұрын
Know your limits buddy. Also practice your epsilon delta proofs.