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Topic: Nhood Space
Replies: 24   Last Post: Jul 3, 2013 10:43 PM

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Registered: 12/4/12
Re: Nhood Space
Posted: Jun 30, 2013 10:18 PM
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On 6/30/2013 9:45 AM, dullrich@sprynet.com wrote:
> On Sat, 29 Jun 2013 21:39:59 -0700, William Elliot <marsh@panix.com>
> wrote:

>> (S,<<) is a nhood space when << is a binary relation for P(S) and
>> for all A,B,C subset S
>> empty set << A << S
>> A << B implies A subset B
>> A << B implies S\B << S\A
>> A << B/\C iff A << B and A << C

> You need to clarify the context! We've been through
> this before. Tell us whether
> (i) this is an actual definition you saw somewhere

These are proximity neighborhoods.


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