fom
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Registered:
12/4/12


Re: Nhood Space
Posted:
Jun 30, 2013 10:18 PM


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.
http://en.wikipedia.org/wiki/Proximity_space

