I just got a call from a good friend who is in the final terms of his ME degree. He needed some leads on the field of math that was needed to determine a solution to this problem. Given a general graph on a plane, deform the plane in 3 space, now what is the equation which describes the graph. I told him differential geometry. Did I do right? (I told him he should come in here and post his question, this is just in case he doesn't!