Nice work Kimberley! Really helps me when you explain these concepts! Just bringing to your attention that at around 1:47 you referred to "In" as the inverse but I think you may have meant the identity matrix? Just to avoid any confusion... Love the videos :)
9:01 That actually is a proof that the matrix 1/(ad-bc) * [ -d , -b ; -c , a ] is *an* inverse of the matrix A= [a, b ; c , d ]. Coupled with the theorem that an inverse, if it exists, is unique, it suffices to show it is *the* inverse matrix of A , symbolized by A^-1.
that's just how you create an inverse 2x2 matrix upper-left to bottom-right elements switch order. Bottom left to upper right switch signs. If you wouldn't switch the signs, multiplying a matrix with the inverse wouldnt result in a identity matrix (look at 7:24), the diagonal fro mbottom-left to upper-right become 0 (cd-cd) = 0 At the start of the video she explained, matrix * inverse should be idenity (just like how 3 * 1/3 = 1) So the sign switch is done so that property hold
I got scared by that “Noo”
I've been up for 3 days cramming for my final, when I heard that "noo"... I genuinely thought I was hallucinating
me watching this at 3am then suddenly that "noo!"
I didn’t even know that was there!
9:06 😂
Haha I don't even know what that is!
😂sounds like a cat
Hahahaha, heard that and went straight to the comments lmao
It's the most played part of this video LOL.
Me every time I try linear algebra problems on my own 9:06
Haha that is funny and also the noise is a little scary. Apparently the ghosts in my house don’t like linear algebra.
I was wondering if only I heard the sound 🤣
Thank you for posting these great videos. I am taking Open Learning courses and you have helped me get A's in Discrete math and Linear Algebra.
Nice work Kimberley! Really helps me when you explain these concepts! Just bringing to your attention that at around 1:47 you referred to "In" as the inverse but I think you may have meant the identity matrix? Just to avoid any confusion... Love the videos :)
I love the way you explain. Thank you !
So nice of you
You are the one of the best teachers
Is the cat okay?? 😂
No cat. Just twin toddlers
9:06 NOOOYY XD
Its the middle of the night and that NO startled me 😭
Thank you the way you explain things makes learning easy and somth.
you got me so bad
i tried finding the inverse immediately without checking first if it has an inverse or not LOL
Thank you so much
9:01 That actually is a proof that the matrix 1/(ad-bc) * [ -d , -b ; -c , a ] is *an* inverse of the matrix A= [a, b ; c , d ].
Coupled with the theorem that an inverse, if it exists, is unique, it suffices to show it is *the* inverse matrix of A , symbolized by A^-1.
Easy stuff thanks for the great explanation.
@ 9:06 some little UA-cam ghost doesn't approve your solution ))))))))))
sounded like a cat haha
@1:46 do you mean matrix A times the Identity matrix = A?
Yes :)
how about a set A with inverse A-, how to solve A^-2
Find the inverse of 3by 3 matrix
Kim's a brainy babe.
5:31 i dont get why b and c are negatives
that's just how you create an inverse 2x2 matrix upper-left to bottom-right elements switch order. Bottom left to upper right switch signs. If you wouldn't switch the signs, multiplying a matrix with the inverse wouldnt result in a identity matrix (look at 7:24), the diagonal fro mbottom-left to upper-right become 0 (cd-cd) = 0
At the start of the video she explained, matrix * inverse should be idenity (just like how 3 * 1/3 = 1)
So the sign switch is done so that property hold
I don't get it at all
Noooooo 🤣
8:00
9:06 what if shes being abused????
lol
by math? 😂😂
nooooo
bu videoya geri dön