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: (5)are all Univ.Western Ontario mathematicians like
Ajneet Dhillon, Matthias Franz, John Jardine as dumb as Dan
Christensen, teaching a Conic section is ellipse, when in t
ruth it is an oval?

Replies: 4   Last Post: Oct 3, 2017 12:10 PM

 Search Thread: Advanced Search

 Messages: [ Previous | Next ]
 plutonium.archimedes@gmail.com Posts: 18,572 Registered: 3/31/08
Re: (5)are all Univ.Western Ontario mathematicians l
ike Ajneet Dhillon, Matthias Franz, John Jardine as dumb as
Dan Christensen, teaching a Conic section is ellipse, when
in truth it is an oval?

Posted: Oct 3, 2017 8:45 AM
 Plain Text Reply

Now the reason Franz makes so many geometry mistakes, like Dan Christensen is because both were mistaught, very much mistaught as seen in the below exchange -- what is distinct and not distinct and so they cannot tell the difference between a circle, ellipse or oval. Can they tell the difference between a plant and animal or did they miss that in graduate school.

On Wednesday, January 25, 2017 at 10:08:09 AM UTC-6, Peter Percival wrote:
> Dan Christensen wrote:
> > On Wednesday, January 25, 2017 at 9:47:32 AM UTC-5, Archimedes Plutonium wrote:
> >> On Wednesday, January 25, 2017 at 8:27:19 AM UTC-6, Dan Christensen wrote:
> >>> On Wednesday, January 25, 2017 at 9:16:52 AM UTC-5, Archimedes Plutonium wrote:
> >>>> PAGE58, 8-3, True Geometry / correcting axioms, 1by1 tool, angles of logarithmic spiral, conic sections unified regular polyhedra, Leaf-Triangle, Unit Basis Vector
> >>>>
> >>>> The axioms that are in need of fixing is the axiom that between any two points lies a third new point.

> >>>
> >>> The should be "between and any two DISTINCT points."
> >>>

> >>
> >> What a monsterous fool you are
> >>

> >
> > OMG. You are serious. Stupid and proud of it.

>
> And yet Mr Plutonium is right.  Two points are distinct (else they would
> be one) and it is not necessary to say so.
>

On Tuesday, October 3, 2017 at 5:04:59 AM UTC-5, Me wrote:

> Cone/Cylinder (side view):
>
> / | \ (with b <= a)
> /b | \
> /---+---´ <= x = h
> / |´ \
> / ´ | \
> / ´ | \
> x = 0 => ´-------+-------\
> / a | \
>
> (cone: b < a, cylinder: b = a = r)
>
> r(x) = a - ((a-b)/h)x
> d(x) = a - ((a+b)/h)x
>
> y(x)^2 = r(x)^2 - d(x)^2 = ab - ab(2x/h - 1)^2 = ab(1 - 4(x - h)^2/h^2
>
> => (1/ab)y(x)^2 + (4/h^2)(x - h)^2 = 1 ...equation of an ellipse
>
> Some considerations:
>
> => y(h/2 + x')^2 = sqrt(ab - ab(2(h/2 + x')/h - 1)^2) = ab - ab(2x'/h)^2
>
> => y(h/2 + x') = sqrt(ab) * (sqrt(1 - (2x'/h)^2) ...symmetric relative to h/2 (hence Ec = cF)
>
> => y(h/2) = sqrt(ab) (= Gc = cH)
>
> ======================================================
>

Franz, do you understand that

Ajneet Dhillon is distinct from Matthias Franz which is distinct from University of Western Ontario.

Me thinks:: Me thinks Franz has much to -- de-learn as he grows older -- in order to become wiser

Franz, do you see that a oval is distinct from a ellipse

Date Subject Author
10/3/17 plutonium.archimedes@gmail.com
10/3/17 Me
10/3/17 plutonium.archimedes@gmail.com
10/3/17 Me
10/3/17 Me

© The Math Forum at NCTM 1994-2018. All Rights Reserved.