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Topic: Stone Cech
Replies: 49   Last Post: Mar 28, 2013 12:15 PM

 Messages: [ Previous | Next ]
 David C. Ullrich Posts: 21,553 Registered: 12/6/04
Re: Stone Cech
Posted: Mar 20, 2013 9:53 AM

On Tue, 19 Mar 2013 21:25:44 -0700 (PDT), Butch Malahide
<fred.galvin@gmail.com> wrote:

>On Mar 19, 8:49 pm, William Elliot <ma...@panix.com> wrote:
>> On Tue, 19 Mar 2013, David Hartley wrote:
>> > <ma...@panix.com> writes
>> > > On Mon, 18 Mar 2013, David Hartley wrote:
>>
>> > > > > Perhaps you could illustrate with the five different one to four point
>> > > > > point compactifications of two open end line segements.

>>
>> > > > (There are seven.)
>>
>> > > Five without homeomorphisms.
>>
>> > ||
>> > |O
>> > O O
>> > |
>> > 9
>> > 8
>> > O

>>
>> 1       8
>> 2       0       00      6
>> 3       01      1
>> 4       11
>>
>> Ok, seven non-homeomophic finite Hausdorff compactications.

>

Surely there's no simple formula for that?

The "obvious" approach seems like starting with the number
ofpartitions of 2n, which is already hopeless, and then
somehow factoring out the ones that give homeomorphic
compactifications... hopeless squared. Is there a better
way, or are you just making trouble again or what?

Date Subject Author
3/14/13 William Elliot
3/14/13 fom
3/15/13 fom
3/16/13 William Elliot
3/15/13 David C. Ullrich
3/17/13 William Elliot
3/17/13 David C. Ullrich
3/17/13 fom
3/18/13 David C. Ullrich
3/18/13 fom
3/18/13 David Hartley
3/19/13 William Elliot
3/19/13 David Hartley
3/19/13 William Elliot
3/20/13 Butch Malahide
3/20/13 David C. Ullrich
3/20/13 Butch Malahide
3/20/13 Butch Malahide
3/21/13 quasi
3/21/13 quasi
3/21/13 quasi
3/21/13 quasi
3/21/13 Butch Malahide
3/21/13 quasi
3/22/13 Butch Malahide
3/22/13 Butch Malahide
3/22/13 Butch Malahide
3/22/13 quasi
3/22/13 David C. Ullrich
3/22/13 David C. Ullrich
3/22/13 Butch Malahide
3/23/13 Butch Malahide
3/23/13 David C. Ullrich
3/23/13 David C. Ullrich
3/23/13 Frederick Williams
3/23/13 David C. Ullrich
3/23/13 Frederick Williams
3/22/13 Butch Malahide
3/23/13 David C. Ullrich
3/22/13 Butch Malahide
3/23/13 quasi
3/23/13 Butch Malahide
3/23/13 Butch Malahide
3/24/13 quasi
3/24/13 Frederick Williams
3/24/13 quasi
3/25/13 Frederick Williams
3/28/13 Frederick Williams
3/25/13 quasi
3/19/13 David C. Ullrich