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DEDUCTIVE MODELS

OF ABDUCTION

Some of the explanations entail their

con

clusion only in a

defeasible

way

(there are many potential

explanations)

-

Nonmonotonicity

-

Generalizations

Explanations are relatively

implausible

Suitable technical tools

able to capture the notion of

An

explanation

for

b

relative to background

theory T will be any

a

that,

together with T, entails

b

(normally with the

additional condition that

{

a

}

�

T

be

consistent

)

The abductive conclusion

a

has to

cover

the situation

b

T

�

{

a

}

`

b

The abductive conclusion

a

does not

have to introduce

inconsistencies

in

the background theory

T

�

b

0

�a

preference among explanations

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