in one of my questions a 2x2 matrix is mentioned that is , it doesnt tell me what it is but somewhere else in my notes it mentions that . can someone please tell me (quickly) what this matrix is?

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- August 25th 2011, 07:33 PM #1

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- August 25th 2011, 08:32 PM #2

- August 26th 2011, 07:41 AM #3