Feb 27, 2012 #1 Ask4material Messages 17 Reaction score 0 Have you ever see any books discussing these problems? I don't know the name of these topic.
Feb 27, 2012 #2 micromass Staff Emeritus Science Advisor Homework Helper Insights Author Messages 22,169 Reaction score 3,327 You have to be a bit more specific that this, I'm afraid...