I am an UG student majoring in Physics. I am just starting classical coursework, but I have had, for the past 10 or so years, a great interest in Quantum Theory. I have read nearly every popular-level (read: very little, if any, math) book published in the last 15 years on the subject, but just over the last 2 years have I really started to study the prerequisite math to really get into it. So, I am actually doing an art project that will have QM as it's theme; the background of which will be equations. So I guess what I am asking is what do you believe are the most important equations, expressions, etc in QM that really encapsulate the theory? So, obviously, Heisenberg's Uncertainty inequality; Schrodinger's Equation (but which form of it). What else? I need 5 in total. Thanks in advance for your opinion/help!