Hello people! I'm studying about collineation. It seems to be simple, but I can't understand so much and I can't find so many things about this subject... Can someone explain to me what exactly is a Collineation? Is this the same thing as Affine Transformation? Is there examples that functions that are transformations but not collineation? I've found about F(x,y)=(x^3,y) but is there another one? Every book that I study just tells about this example, I wanted to see more... Thank you so much!!