: SamHB: Thank you so, so much for your comments! You're absolutely right; my page was not up to par, and I was wondering how to better explain exact differential equations (and make my equations larger!) Also, that is a good hobby. My hobby is studying physics/quantum mechanics/relativity, even though I am a mechanical engineer by trade. :-D [[User:PhyllisS|PhyllisS]] 00:55, 31 July 2010 (EDT)