Introduction - If you have any usage issues, please Google them yourself
We are all familiar with the famous Riemann function, but about the image you clear it? In addition to those points of the top, the other is difficult to draw it? Do you want to take a look at the "huddled together" following the distribution point? Surface geometry of the saddle, hyperboloid of one sheet how generated by the straight line, is not also want to see what the? These are inseparable from the drawing.