I am just coming back to math after a, oh 30 year or so, vacation. In the class I'm taking, we are studying Partial Fraction Decomposition ( Px/Qx:Qx). It doesn't entirely make sense to me, tho like a monkey typing the great American novel, I can solve them given enough time. I am just having trouble getting my hands around the overall concept, and I think what's missing is the why: What exactly are they used for, and will I see them again in calculus or DE or anytime soon? I am hoping that if I can understand the why, the how will become easier. Thanks in advance.