# Re: similarity problem

Carlos Gershenson (carlos@jlagunez.iquimica.unam.mx)
Tue, 13 Oct 1998 22:36:05 +0200 (MET DST)

You can define similarity as

S(a,b)= a AND b / a OR b

(This was said separetly by Bill Siler and Jonathan Lawry...)

On Tue, 6 Oct 1998, formato ferrante wrote:

> I have the following problem, arising from a definition of a similarity
> in a data base.
> The problem is
> Given two flats, x and y, give a similarity relation based on the
> distance of x and y from the center of a city/town.
> This is not simply a dualisation of a (pseudo)metrics.
> I think that I should first quotient the set of flats w.r.t the
> equivalence relation defined as follows
> xRy if d(x,center)=d(y,center)
> Then, I can proceed as usual,.i.e
> I give a metrics, I normalize it
> w.r.t. the radius (diameter) of a city and then I apply the duality
> function which fits the t-norm. (for example, in the case of the
> minimum, I take 1-d(x,y).
> Is there a better way to solve the problem?
> I mean, in therm of indistinguishability operators H...
> Ferrante Formato
>
>
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"About a fact there are as many different truths
as there are different sets in the universe...
and lies, much more."

Carlos Gershenson
http://132.248.11.4/~carlos/

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