I'm reading back over a calculus book getting ready for an exam and I'm seeing a note that I don't understand.(adsbygoogle = window.adsbygoogle || []).push({});

It says to make sure, when rewriting a ln function that the domain is the same, then it provides an example of when it's not the same, yet says nothing more. Is this rewritten form valid?

https://dl.dropbox.com/u/15809883/ln.png [Broken]

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# The natural log function

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