Hi guys, I thought that |psi|^2 was a probability density function and that when integrated over a region this would give me the probability to find the particle in that region. (assuming that psi was normalized) But some ph.d. in physics told me that no, that's wrong and when I use the word particle I'm already using an interpretation of QM. I notice that Landau never mention the word "particle" when he defines psi. Now that I think about it, if I have a system of many particles and a single psi representating the probability density funtion of all those particles, I do not really know what the integral of |psi|^2 would represent in that case. The prob. to measure a single one of these many particles inside the integrated region? Am I completely off?