I have run some Solidworks Simulation studies and I was wondering what the equations were that the FFEPlus or any of the other solvers actually solved. I know that FFEPlus is an iterative solver, but I do not know exactly what it is iterating on. I was told that it essentially solves Hook's Law, but I do not know what the exact equations are. Does anyone know if there are any technical reference material or something similar. Thanks.