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fom
Posts:
1,968
Registered:
12/4/12


Re: Collinear
Posted:
May 7, 2013 6:31 PM


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 >  > AEF > > Maybe I am not recalling correctly. > > This is better: > > http://mathworld.wolfram.com/PaschConfiguration.html > >
Whoops!
Obviously was not thinking....



