Seminar 9 So this day, we have been working on some very interesting topics. It was actually the first day that I attended a Math-seminar and it was long overdue. The first exercise was about contour lines. So, let us step one step back. Traditionally, we have learnt to see to coordinate system in 2D-dimensions. But originally the coordinate system was meant to be viewed in a 3D-dimensions. Here it was supposed that we had 3 main coordination lines: x, y, z where x would be the length, y would diagnose and z would the height. Assuming this and in order to view the coordinate system in a 2D-dimension, we have to assume that we look on coordination-system from above. So what is a contour line? I would say that a contour line is a line of body illustrated in a 3-dimensions room. If we translate it into a 2-dimensional room, the contour line is actually what would describe a graph or a function of two variables which would be x,y as we look on the system from above (thus "ign...