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Topic: Off Topic Physics/math question
Replies: 3   Last Post: Jan 5, 2013 12:35 PM

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William Elliot

Posts: 2,637
Registered: 1/8/12
Re: Off Topic Physics/math question
Posted: Jan 5, 2013 1:08 AM
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On Fri, 4 Jan 2013, wrote:

> If y(x) = 1 / x
> then y(x) > 0 when x > 0 and y(x) < 0 when x < 0.
> According to the power rule of Calculus, y'(x) = -1 / x^2.
> So y'(x) is always negative.
> Are we losing information by taking the derivative?

Yes, f(x) = 1/x + c has the same derivative.

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