In my opinion, PostScript is superior, so I always give the PostScript link first. If you're using a school computer or some other computer with default software installed, then you probably don't have a PostScript reader. But if you can install software on your computer, then I encourage you to download Ghostview, which is available for Windows, Macintosh, Linux, and other systems. (Note that you need to download and install two separate programs, GPL Ghostscript and GSview; these are both available from the same web site.)
Alternatively, you can read the PDF version. With any luck, you already have a PDF reader installed; if not, Ghostview can also read PDF files. But the only reason to prefer PDF is if your computer already has a PDF reader installed. Of course, there are PostScript (and PDF) files elsewhere on the Internet, so you may as well install Ghostview anyway if you want a computer that can do everything.
The permanent URI of this web page
is
http://tobybartels.name/MATH-0950/2008SP/downloading/
.