Drexel dragonThe Math ForumDonate to the Math Forum


Math Forum
 Ask Dr. Math
 Discussions
 Internet Newsletter
 MathTools
 Problems of the Week
 Teacher2Teacher
 Teacher Exchange
 Workshops

Search All of the Math Forum:
Browse our Internet Mathematics Library

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


Math Forum » Discussions » sci.math.* » sci.math.independent

Topic: Was solving the Poincare's conjecture a big deal?
Replies: 13   Last Post: Sep 6, 2006 11:50 PM

Advanced Search
Reply to this Topic Reply to this Topic

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Gib Bogle

Posts: 1,495
Registered: 12/8/04
Re: Was solving the Poincare's conjecture a big deal?
Posted: Sep 6, 2006 6:12 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Pubkeybreaker wrote:

> porky_pig_jr@my-deja.com wrote:
>
>>Richard Henry wrote:
>>
>>
>>>What I heard was cutting out the middle removed the undercooked part,
>>>when donuts were deep-fried in lard.
>>
>>Speaking of cutting out the middle. If I start with a sphere, and
>>somehow removed the 'inner sphere',
>
>
> What "inner sphere". I think you are confusing "sphere" with "ball".
> A unit sphere (in E_n) has the equation x_1^2 + x_2^2 + ... + x_n^2
> = 1.
> It does NOT include its interior. To include the interior you need:
> x_1^2 + x_2^2 + ... + x_n^2 < = 1. (note the inequality)
>
>
>
>>the resulting solid
>
>
> There is no solid. A sphere is an n-dimensional SURFACE.
>

Balls!

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2013. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.