On Thursday, October 5, 2017 at 9:38:55 AM UTC-7, Archimedes Plutonium wrote: > Alright, if our knife in Conic and Cylinder sectioning was always the normal knife then the Conic section is always a Oval, never an Ellipse. The Cylinder section is always a ellipse, never an oval. > > So, that is true and I proved it.
No, you haven't done it yet. You just did some hand-waving.