I'm curious about the use of the Dirac Delta function. I am familiar with the function itself, but have never really seen in used in actual problems. The only problems I've worked with the function are those specifically about the function (ie. Evaluate the Dirac Delta function at x=3). My question is, how do I recognize the situation in which I can use the Dirac Delta function and how do I go about using it? Is it possible to use it to determine the density of a "point mass"? How would this be done? Thanks!