It is available in several languages including German, Spanish, Russian, Serbian, and Portuguese. The program includes a big sample gallery with explanations and a tutorial. You can easily see that the point (x,y,z)=(0,0,0) is not on the sphere while the points (1,0,0), (0,1,0) and (0,0,-1) for example solve the equation. As an example look at x2+y2+z2-1=0, the equation of a sphere. All points in space that solve the equation are displayed and form the surface. The surfaces shown are given by the zero set of a polynomial equation in the variables x, y, and z. Mathematically, the program visualizes real algebraic geometry in real-time.
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