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Matrix multiplcation

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Xt

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Dec 28, 2009, 3:01:06 AM12/28/09
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Hi folks. This is a bit off topic but can anyone show me quickly why
any mxn matrix multiplied bu any other nxm matrix always produces a
singular mxm matrix, so long as m>n?

Thanks

xt

Greg Heath

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Dec 30, 2009, 9:50:38 AM12/30/09
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Incorrect wording. I'll let you correct it.

If m > n ,rank(A(m,n)) < = n

rank(A*A') = rank(A) = rank(A')

Hope this helps.

Greg

Xt

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Dec 30, 2009, 2:57:42 PM12/30/09
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Thanks Greg. It's obvious now you mention ranks. xt

Zeek

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Jan 13, 2010, 11:23:49 PM1/13/10
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If I wanted to look this up online, to get a very basic introductory
explanation of this, where should I go?

Greg Heath

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Jan 14, 2010, 2:02:29 PM1/14/10
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Wikipedia
Wolfram
Google

There are online tutorials and courses on Linear Algebra.

Hope thia helpa.

Greg

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