<p>is it ok if i use the 4th edition instead of the 5th? I'm wondering what the realn difference is between the two of them, aside from a $200 price difference</p>
<p>Never took the class, but in general, different editions often times have different problem sets in addition to the content being rearranged somewhat. A $200 price different seems pretty hefty though, so as long as you have a friend to compare the problems with, it should be fine…</p>