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Individuals here is not such a good word, because usually are
some generous concepts and sometimes some individuals.
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I:L->D,where L={A,∧,∨,¬},if I take
∧,∨,¬ as the domain of interpretation function,that will
make no sense. So,the domain of interpretation should not
include the standalone "∧,∨,¬ ",but it can bbtain the
symbol in the form of wff,namely logic symbol combined with
Atomic ,for instance I(¬A),I(A∧B).
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We can derive that in extensional model,D is a set which
including the studied instances,L is a set which can obtain
objects, attributes,relations and logic operator ∧, ∨,
¬.
As mentioned D = domain (a is in D). The set of objects of interest. But for the formal intensional model we don’t provide any objects as outcome, but we only provide the T/F. So, the D = domain, should be like only = {T, F} as mentioned in the next slide.
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