Jeff, List:
On the contrary, just as I said, the diagram in my Figure 3 shows the three
*different *conic sections--an ellipse, a parabola, and a hyperbola--as
they appear in *projective *geometry. I adapted it from an online article
by Vince Matsko, where he explains this as follows.
VM:
Hi Jon S, Gary F, all,
Jon, I've read your paper on time, although it was some time ago, so my memory
is not fresh.
The diagram of the lines and the circles in figure3 do not appear to show three
different types of conic sections. Rather, they show three circles intersecting
with a line at
