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Re: simulation vs. model



Judith,
 
I use the term 'simulation' as it is described in LI ch. 7 and 9.
 
As you say, "In the example you cite, there is no argument over the fact that simulation is not a congruence between entailment structures.". Therefore, by the very criteria for a modelling relation, it fails, and thus the simulation is not a model. 
 
Then, "However, there is congruence over external observables. ". Yes, that makes it a simulacra or simulation, but it does not make it a model. Matching only the behavior of observables without regard for the entailment relations is mimesis, not modelling.
 
Regards,
Tim
 
-----Original Message-----
From: ROSEN Forum [mailto:***On Behalf Of Judith Rosen
Sent: Thursday, December 30, 2004 11:44 PM
To: ***
Subject: Re: simulation vs. model

Tim,
 
Define "simulation".
 
To simulate something is to... what?
 
In the example you cite, there is no argument over the fact that simulation is not a congruence between entailment structures. However, there is congruence over external observables. So... in the case where you are modeling a storm for some film you're directing (setting: "... it was a dark and stormy night..."), the external observables are those properties you need to model. In the case where you are trying to predict what the weather in some location is going to be like on next Thursday... you must model different aspects which correspond to entailment structures. My father's point is that human beings tend to think if they can simulate a system convincingly enough, that's the same as creating an exact replica... and human beings also tend to think that, because we can fool ourselves and each other with a convincing simulation, that systems which "seem" complex are really simple underneath.
 
Judith