.


:




:

































 

 

 

 





( ) .

Answ 0, .

; , Answ , "Q is true" ( Q ).

'if Condition then Q'

Condition Answ Q.

Q , "askable" (), , Q.

' ! and 02, Q1,

16. 363


Q1 , Answ, "0
is false", Q2
Q1 Q2 Answ.

Q Ql or Q2, Q1,

Q1 , Answ
Q1; Q2 ,
Q2 , Answ Q2.

not Q .

,

, ( "Why?"), . , : Is a true?

: Why?

, .

, b Ra, , ,

, z Ry, Z .

, . ( ), . . , , , AND/OR (. 16.2). "Why?" . , .



II. Prolog



( ]


 


. 16.2. - . , , , , .

,

, , , "How?". , , , , .. , . , , . 15, . , , , :

peter isa carnivore

was derived by rule3 from peter isa mammal was derived by rulel fr o m peter has hair

was told and

peter eats meat was told


16.







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