Can somebody tell me what this means? dy/dx means a small change in y with respect to a small change in x. du/u means a small change in u with respect to no change in u?

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- March 15th 2010, 10:02 PM #1

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- March 15th 2010, 10:09 PM #2

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- March 15th 2010, 10:11 PM #3