Assume |x| = n and |y| = m. Suppose that xy = yx. Prove that .

What is the commutativity used for?

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- October 8th 2011, 07:56 PM #1

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- October 8th 2011, 08:11 PM #3

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- October 9th 2011, 01:19 PM #6

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- October 9th 2011, 01:27 PM #7

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