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I'm trying to download Mathematics of the Discrete Fourier Transform so that I can read through it off-line on my iPad (which doesn't have an Internet connection)

I have used wget in Linux. It seems that the OSX alternative is curl, but I cannot find how to download recursively anywhere in the mammoth manual page.
Is this even the right tool for the job? If so, how to use it?

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You'll find here a way for curl to download more files in one command, but it seems it cannot download recursively as wget does. – Coren Feb 18 '12 at 10:39

Curl will not download things for you recursively. You'll need to install wget on your Mac. The easiest way to do this is to install MacPorts, which gives you access to a large repository of open source software, and the run:

port install wget

...and wait a bit. This will install wget and all its prerequisites.

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