Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: How we get a Ellipse from a Conic, and how we get a Oval from
Cylinder Sections-- knifes that are V and asymmetrical V shaped

Replies: 27   Last Post: Oct 8, 2017 12:41 AM

 Messages: [ Previous | Next ]
 Jan Bielawski Posts: 1,037 Registered: 5/21/05
Re: How we get a Ellipse from a Conic, and how we get a Oval from
Cylinder Sections-- knifes that are V and asymmetrical V shaped

Posted: Oct 6, 2017 1:05 AM

On Thursday, October 5, 2017 at 6:59:20 PM UTC-7, Archimedes Plutonium wrote:
> On Thursday, October 5, 2017 at 4:55:17 PM UTC-5, qbwr...@gmail.com wrote:
> > On Thursday, October 5, 2017 at 1:11:12 PM UTC-7, Dan Christensen wrote:
> > > On Thursday, October 5, 2017 at 12:38:55 PM UTC-4, Archimedes Plutonium wrote:
> > > > Alright, if our knife in Conic and Cylinder...
> > >
> > > Archie, for \$52.49, you can save yourself all this embarrassment. Order the "Conic Sections Model" made of transparent plastic. See for yourself -- no knives or scissors required -- that at an ellipse is indeed a conic section.
> > >
> > > http://www.eaieducation.com/Product/520610/Conic_Sections_Model.aspx
> > >
> > > If you can't afford it, maybe we can take up a collection for you.
> > >
> > >
> > > Dan

> >
> > I have seriously considered buying and mailing a model to Archie.
> >
> > It seems essential that the model be very precisely made.
> > It seems essential that the eccentricity of the model be almost 1.
> > It seems essential that the intersection be able to be removed, flipped
> > in all four possible orientations and replaced to see it is an exact fit.
> >
> > If any of those were not the case then I'm certain that Archie
> > would dream up some tortured convolution to claim that this doesn't
> > disprove his delusion and in fact it actually proves he is correct.
> >
> > It would be cute if there were two spheres of just the right size were included.
> >
> > I have not found a model online available for purchase that I thought
> > would be sufficiently overwhelmingly convincing. I have looked at
> > making such a model by hand and I don't think it would be precise enough.
> >
> > Way back soon after he started screeching his oval nonsense I told him
> > that he should go to a machine shop and have them produce a really
> > precise model out of steel that would definitely settle this question.
> >
> > He didn't do that, just like he doesn't do anything else that might
> > refute his mental illness. He refuses, for example, to look at web
> > pages that people point out to him which would refute his illness,
> > because he claims to be frightened of malware, but at the same
> > time he is happy to go to web pages and scrape the lists of names of
> > false foggy fools who won't teach his mental illness to the world.
> >
> > If anyone can find a sufficiently overwhelmingly convincing model
> > available for purchase then I would chip in for the price.
> >
> > I've also considered doing the same for other models which would
> > refute his mental illness point by point. But they would have to be
> > overwhelmingly obviously convincing to the mind of a twelve year old.
> > They can't involve algebra, Archie seems to have lost all that long ago.
> > They can't involve proof, Archie seems to have lost all that long ago.
> >
> > I'm becoming more and more convinced that people making posts just
> > telling him that he is wrong and stupid only reinforce Archie's
> > mental illness, they show him that no one, or almost no one, believes
> > what he is saying and that reinforces his belief of how special he
> > imagines himself to be.
> >
> > If in the first few days of a new novel claim posted by Archie, long
> > before his dog brain has become invested in the claim, if someone
> > takes the time to obviously simply prove at the level that a
> > twelve-year-old can see that there is a mistake then there have been
> > a number of cases where Archie silently drops that claim, never says
> > a word about how he was wrong, and moves on to something else.
> > But once Archie has fully invested his dog brain in a claim then
> > there seems to be nothing that can change what is left of his mind.

>
> Well thanks for the thoughts, but I already proved several times over that a cone is always a Oval section

No, this is false. Do you have a point to make?

--
Jan