Logic Programming (PLP 11) Predicate Calculus, Horn Clauses, Clocksin-Mellish Procedure
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1 Logic Programming (PLP 11) Predicate Calculus, Horn Clauses, Clocksin-Mellish Procedure Carlos Varela Rennselaer Polytechnic Institute November 7, 2016 C. Varela 1
2 An Early (1971) Conversation USER: Cats kill mice. Tom is a cat who does not like mice who eat cheese. Jerry is a mouse who eats cheese. Max is not a mouse. What does Tom do? COMPUTER: Tom does not like mice who eat cheese. Tom kills mice. USER: Who is a cat? COMPUTER: Tom. USER: What does Jerry eat? COMPUTER: USER: Cheese. Who does not like mice who eat cheese? COMPUTER: Tom. USER: What does Tom eat? COMPUTER: What cats who do not like mice who eat cheese eat. C. Varela 2
3 Another Conversation USER: Every psychiatrist is a person. Every person he analyzes is sick. Jacques is a psychiatrist in Marseille. Is Jacques a person? Where is Jacques? Is Jacques sick? COMPUTER: Yes. In Marseille. I don t know. C. Varela 3
4 Logic programming A program is a collection of axioms, from which theorems can be proven. A goal states the theorem to be proved. A logic programming language implementation attempts to satisfy the goal given the axioms and built-in inference mechanism. C. Varela 4
5 Propositional Logic Assigning truth values to logical propositions. Formula syntax: f ::= v symbol f f and f f or f f if and only if f f implies f not C. Varela 5
6 Truth Values To assign a truth values to a propositional formula, we have to assign truth values to each of its atoms (symbols). Formula semantics: a b a b a b a b a b a False False F F T T T False True F T F T T True False F T F F F True True T T T T F C. Varela 6
7 Tautologies A tautology is a formula, true for all possible assignments. For example: p p The contrapositive law: (p q) ( q p) De Morgan s law: (p q) ( p q) C. Varela 7
8 First Order Predicate Calculus Adds variables, terms, and (first-order) quantification of variables. Predicate syntax: a ::= p(v 1, v 2,,v n ) predicate f ::= a atom v = p(v 1, v 2,,v n ) equality v 1 = v 2 f f f f f f f f f v.f universal quantifier v.f existential quantifier C. Varela 8
9 Predicate Calculus In mathematical logic, a predicate is a function that maps constants or variables to true and false. Predicate calculus enables reasoning about propositions. For example: C [rainy(c) cold(c) snowy(c)] Quantifier (, ) Operators (,,,, ) C. Varela 9
10 Quantifiers Universal ( ) quantifier indicates that the proposition is true for all variable values. Existential ( ) quantifier indicates that the proposition is true for at least one value of the variable. For example: A B [( C [ takes(a,c) takes(b,c)]) classmates(a,b) ] C. Varela 10
11 Structural Congruence Laws P 1 P 2 P 1 P 2 X [P(X)] X [ P(X)] X [P(X)] X [ P(X)] (P 1 P 2 ) P 1 P 2 (P 1 P 2 ) P 1 P 2 P P (P 1 P 2 ) (P 1 P 2 ) (P 2 P 1 ) P 1 (P 2 P 3 ) (P 1 P 2 ) (P 1 P 3 ) P 1 (P 2 P 3 ) (P 1 P 2 ) (P 1 P 3 ) P 1 P 2 P 2 P 1 C. Varela 11
12 Clausal Form Looking for a minimal kernel appropriate for theorem proving. Propositions are transformed into normal form by using structural congruence relationship. One popular normal form candidate is clausal form. Clocksin and Melish (1994) introduce a 5-step procedure to convert first-order logic propositions into clausal form. C. Varela 12
13 Clocksin and Melish Procedure 1. Eliminate implication ( ) and equivalence ( ). 2. Move negation ( ) inwards to individual terms. 3. Skolemization: eliminate existential quantifiers ( ). 4. Move universal quantifiers ( ) to top-level and make implicit, i.e., all variables are universally quantified. 5. Use distributive, associative and commutative rules of,, and, to move into conjuctive normal form, i.e., a conjuction of disjunctions (or clauses.) C. Varela 13
14 Example A [ student(a) ( dorm_resident(a) B [takes(a,b) class(b)])] 1. Eliminate implication ( ) and equivalence ( ). A [student(a) ( dorm_resident(a) B [takes(a,b) class(b)])] 2. Move negation ( ) inwards to individual terms. A [student(a) ( dorm_resident(a) B [ (takes(a,b) class(b))])] A [student(a) ( dorm_resident(a) B [ takes(a,b) class(b)])] C. Varela 14
15 Example Continued A [student(a) ( dorm_resident(a) B [ takes(a,b) class(b)])] 3. Skolemization: eliminate existential quantifiers ( ). 4. Move universal quantifiers ( ) to top-level and make implicit, i.e., all variables are universally quantified. student(a) ( dorm_resident(a) ( takes(a,b) class(b))) 5. Use distributive, associative and commutative rules of,, and, to move into conjuctive normal form, i.e., a conjuction of disjunctions (or clauses.) (student(a) dorm_resident(a)) (student(a) takes(a,b) class(b)) C. Varela 15
16 Horn clauses A standard form for writing axioms, e.g.: father(x,y) parent(x,y), male(x). The Horn clause consists of: A head or consequent term H, and A body consisting of terms B i H B 0, B 1,, B n The semantics is: «If B 0, B 1,, and B n, then H» C. Varela 16
17 Clausal Form to Prolog (student(a) dorm_resident(a)) (student(a) takes(a,b) class(b)) 6. Use commutativity of to move negated terms to the right of each clause. 7. Use P 1 P 2 P 2 P 1 P 1 P 2 (student(a) dorm_resident(a)) (student(a) ( takes(a,b) class(b))) 8. Move Horn clauses to Prolog: student(a) :- dorm_resident(a). student(a) :- takes(a,b),class(b). C. Varela 17
18 Skolemization X [takes(x,cs101) class_year(x,2)] introduce a Skolem constant to get rid of existential quantifier ( ): takes(x,cs101) class_year(x,2) X [ dorm_resident(x) A [campus_address_of(x,a)]] introduce a Skolem function to get rid of existential quantifier ( ): X [ dorm_resident(x) campus_address_of(x,f(x)] C. Varela 18
19 Limitations If more than one non-negated (positive) term in a clause, then it cannot be moved to a Horn clause (which restricts clauses to only one head term). If zero non-negated (positive) terms, the same problem arises (Prolog s inability to prove logical negations). For example: «every living thing is an animal or a plant» animal(x) plant(x) living(x) animal(x) plant(x) living(x) C. Varela 19
20 Exercises 72. What is the logical meaning of the second Skolemization example if we do not introduce a Skolem function? 73. Convert the following predicates into Conjunctive Normal Form, and if possible, into Horn clauses: a) C [rainy(c) cold(c) snowy(c)] b) C [ snowy(c)] c) C [snowy(c)] 74. PLP Exercise 11.5 (pg 571). 75. PLP Exercise 11.6 (pg 571). C. Varela 20
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