( ) .
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.