swi-prolog謂詞不起作用

Question

我在swi-prolog中有一個非常簡單的程序，它定義了所有關於家庭關係的謂詞。我還定義了一些事實（基於聖經的亞伯拉罕的家庭）。所以，現在

female(sarah). 
mother(sarah,isaac). 
married(rebekah,isaac). 

，當我在節目類型

?- mother_in_law(sarah,X). 

它應該給我： 所以我定義了一個謂語 「mother_in_law」 是這樣的：

mother_in_law(X,Y):- female(X),mother(X,Z),married(Z,Y). 

和一些事實只有X = rebekah。但是它給了我一些其他的X值，這些值並不符合我定義的條件。

有人能告訴我我做錯了什麼嗎？

非常感謝

我添加了整段文字部分：

father(X,Y). % Define Predicates% 
mother(X,Y). 
married(X,Y). 
male(X). 
female(X). 
parent(X,Y). 
diff(X,Y). 
male_cousin(X,Y). 
brother_in_law(X,Y). 
mother_in_law(X,Y). 
cousin_three(X,Y). 
cousin(X,Y). 
sib(X,Y). 

%Define Facts% 
male(terah). male(abram). male(nahor). male(haran). male(isaac). 
male(lot). male(moab). male(ben_ami). male(bethuel). male(laban). 
male(esau). male(jacob). male(reuben). 
female(sarah). female(milcah). female(lot_daughter_1). female(lot_daughter_2). 
female(rebekah). female(leah). female(dinah). 
father(terah,abram). father(terah,nahor). father(terah,haran). 
father(abram,isaac). father(haran,lot). father(nahor,bethuel). 
father(bethuel,laban). father(laban,leah). father(isaac,jacob). 
father(isaac,esau). 
father(jacob,reuben). 
mother(sarah,isaac). mother(milcah, bethuel). mother(rebekah,jacob). 
mother(rebekah,esau). mother(leah,reuben). 
mother(lot_daughter_1,moab). mother(lot_daughter_2,ben_ami). 
married(abram,sarah). married(nahor,milcah). 
married(isaac,rebekah). married(jacob,leah). 
married(sarah,abram). married(milcah,nahor). 
married(rebekah,isaac). married(leah,jacob). 



%Define complicated predicates% 
    parent(X,Y) :- father(X,Y). 
    parent(X,Y) :- mother(X,Y). 
    diff(X,Y) :- not(X=Y). 
    sib(X,Y):- parent(Z,X), parent(Z,Y), diff(X,Y). %define sibling % 
    mother_in_law(X,Y):- female(X),mother(X,Z),married(Z,Y). %question 1% 
    male_cousin(X,Y):- male(X),father(W,X),parent(Z,Y),sib(W,Z). %question 2% 
    cousin(X,Y):- parent(Z,X), parent(W,Y), sib(W,Z).  %question 3% 
    cousin_three(X,Y):- parent(Z,X),parent(G,Z),parent(H,Y),parent(K,H),cousin(G,K). 
    brother_in_law(X,Y):- male(X),married(X,Z),sib(Y,Z). %question 5-X is married to Y's sibling% 
    brother_in_law(X,Y):- male(X),sib(X,Z),married(Y,Z). %X's sibling is married to Y% 
    brother_in_law(X,Y):- male(X),married(X,W),married(Y,Z),sib(W,Z). % Y is married to the sibling of X's spouse% 

Answer 1

的問題，您的解決方案由於以下事實

mother_in_law(X,Y). 

陳述任何人都是任何人的法律上的母親。

降

father(X,Y). % Define Predicates% 
mother(X,Y). 
married(X,Y). 
male(X). 
female(X). 
parent(X,Y). 
diff(X,Y). 
male_cousin(X,Y). 
brother_in_law(X,Y). 
mother_in_law(X,Y). 
cousin_three(X,Y). 
cousin(X,Y). 
sib(X,Y). 

Answer 2

以下內容添加到你的事實。它的作品。

married(isaac,rebekah). 

一個更好的辦法可能是有結婚的關係本身採取的事實關心已婚（A，B）是一樣的已婚（B，A）