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6)are all German mathematicians like Peter Roquette, Gunther Schmidt KarlOtto Stöhr as dumb as Franz, teachi ng a Conic section is ellipse, when in truth it is an oval?
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Oct 4, 2017 7:05 PM



Me
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Re: Princeton math dept agreeing with Franz for none has spotted the error as dumb as Franz, teaching a Conic section is ellipse, when in truth it is an oval?
Posted:
Oct 2, 2017 1:57 PM


On Monday, October 2, 2017 at 5:00:29 PM UTC+2, Archimedes Plutonium wrote something.
@Archie: You see, my little demonstration proves that (certain) cone sections "as depicted in my diagram" as well as (certain) cylinder sections (as described by you) are ellipses. qed
Note, Archie, that there is no reference to Dandelin Spheres whatsoever.
Not convinced? Can you point out an error in my simple calculation (of the shape of the cone/cylinder section) I provided?
Now you have been offered two proofs with completely different "proof ideas", still not satisfied with it? If so, can you tell us what's WRONG with these demonstrations/proofs?



