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Re: Mathematics

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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
14 Jul 2016 04:38 PM
Let's discuss about it, after all ROBLOX Talk is for discussions.
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1213mkj is not online. 1213mkj
Joined: 08 Mar 2010
Total Posts: 495
14 Jul 2016 04:39 PM
what's you + me equal ^_^
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Zwuh is not online. Zwuh
Joined: 01 Sep 2010
Total Posts: 10820
14 Jul 2016 04:40 PM
I'm good at it

I have to do a 30 page packet for it this summer :(
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Blocks878BackUp is not online. Blocks878BackUp
Joined: 21 Jun 2010
Total Posts: 2437
14 Jul 2016 04:42 PM
Let A and B be matrices.

Show that the inverse of AB is (B^-1)(A^-1).
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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
14 Jul 2016 04:47 PM
"what's you + me equal ^_^" me + you "I'm good at it I have to do a 30 page packet for it this summer :(" Wow, homework, you are unlucky. I am going to make a thread about homework. "Let A and B be matrices. Show that the inverse of AB is (B^-1)(A^-1)." B ^ (-1) * A ^ (-1) = 1/B * 1/A = 1/BA = 1/AB
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Blocks878BackUp is not online. Blocks878BackUp
Joined: 21 Jun 2010
Total Posts: 2437
14 Jul 2016 04:52 PM
Well you can't write a matrix inverse A^-1 as 1/A because this making the assumption that matrix multiplication is commutative, which is not in general.

So to show this,

AB(AB)^-1 = AB(B^-1)(A^-1) = AIA^-1 = AA^-1 = I, where I is the identity matrix.

Make sure to show also (AB)^-1(AB) = I.
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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
14 Jul 2016 04:54 PM
"Well you can't write a matrix inverse A^-1 as 1/A because this making the assumption that matrix multiplication is commutative, which is not in general.

So to show this,

AB(AB)^-1 = AB(B^-1)(A^-1) = A I A^-1 = AA^-1 = I, where I is the identity matrix.

Make sure to show also (AB)^-1(AB) = I."

Whatever, I do not know matrixes nor "I"s, unless they are a square root of -1.
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Blocks878BackUp is not online. Blocks878BackUp
Joined: 21 Jun 2010
Total Posts: 2437
14 Jul 2016 04:56 PM
Yeah, it also depends on the context you're working in.
Big "I" is for identity matrix, or any identity operation.
Little "i" like you mentioned, is the imaginary unit.

If you're doing physics/engineering, you use "j" as the imaginary unit since "i" is used for current.
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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
14 Jul 2016 04:58 PM
We are in the same group!
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Blocks878BackUp is not online. Blocks878BackUp
Joined: 21 Jun 2010
Total Posts: 2437
14 Jul 2016 05:00 PM
Oh wow, I didn't realize that!
OMG!!!
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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
15 Jul 2016 01:22 PM
What do you think?
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PedroMendz is not online. PedroMendz
Joined: 08 Dec 2012
Total Posts: 3763
15 Jul 2016 01:23 PM
Oh, boy, this is actually legit
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MagicGivePen is not online. MagicGivePen
Joined: 26 Nov 2013
Total Posts: 7970
15 Jul 2016 03:08 PM
"Oh, boy, this is actually legit:

What did you except?
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Blocks878BackUp is not online. Blocks878BackUp
Joined: 21 Jun 2010
Total Posts: 2437
15 Jul 2016 08:45 PM
Cool actually, not that many people like math. :D
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