Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

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: Collinear
Replies: 9   Last Post: May 8, 2013 1:12 PM

Advanced Search

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

Posts: 1,968
Registered: 12/4/12
Re: Collinear
Posted: May 7, 2013 6:31 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 5/7/2013 5:25 PM, fom wrote:
> On 5/7/2013 2:48 AM, William Elliot wrote:
>> Let C be a collection of n points with the property that
>> any line L with two points of C on it, has a third point
>> of C on it.
>>
>> How is it that C is collinear, ie all points of C are
>> on a single line?
>>

>
>
> Is this true?
>
> If I recall, there is something from
> design theory called a Pasch configuration.
>
>
> ABC
> AEF
> BDF
> CDE
>
>
> C
> |
> B
> |
> | D
> |
> A----E---F
>
> Maybe I am not recalling correctly.
>
> This is better:
>
> http://mathworld.wolfram.com/PaschConfiguration.html
>
>


Whoops!

Obviously was not thinking....





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

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.