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 Post subject: Re: Matrix proof help PLZ!Posted: Sat, 1 Oct 2011 10:39:00 UTC
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twinwings wrote:
I think...dimensions of Px=nxn and Px=I (I still have some trouble with this)

No! need not be the identity matrix.

We know is invertible k-by-k, hence , hence . If , then , so .

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 Post subject: Re: Matrix proof help PLZ!Posted: Mon, 3 Oct 2011 03:55:50 UTC
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Joined: Mon, 3 Oct 2011 03:54:01 UTC
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Hey guys, i was just wondering if anyone could shed some light on part (c)? I understand the previous 2 parts, but part (c) has me really lost for ideas. Thanks a ton.

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 Post subject: Re: Matrix proof help PLZ!Posted: Mon, 3 Oct 2011 10:03:38 UTC
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chrisdelp wrote:
Hey guys, i was just wondering if anyone could shed some light on part (c)? I understand the previous 2 parts, but part (c) has me really lost for ideas. Thanks a ton.

Just calculate when .

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