Αποτελέσματα Αναζήτησης
unify(Knows (John, v), Knows (z, Mother(z))) = {z/John, v/Mother(z)} Answers: 1. Hates(John,x) with {x/v, v/Jim} (i.e. John hates Jim) 2. Hates(John,x) with {x/v, y/John, v/Leo} (i.e. John hates Leo) 3. Hates(John,x) with {x/v, v/Mother(z), z/John} (i.e. John hates his mother) Most General Unifier In cases where there is more than one ...
∀x (x ≠ John → love (Mary, x)) As in the case of some earlier examples, this is a ‘weak’ reading of except, allowing the possibility of Mary loving John. To get a ‘strong’ reading of except, ruling out that possibility, replace → above by ↔, or add a conjunct “ & ¬ love (Mary, John)” at the end.
2 is the substitution θ = COMPOSE(θ 1,θ 2) such that: SUBST(θ,p) = SUBST(θ 1,SUBST(θ 2,p)) = SUBST(θ 2,SUBST(θ 1,p)) Example 2. Sentence p is P(y) ∧ Q(x) ⇒ R(z) Consider θ 1 = {y/Toto,z/Titi}, θ 2 = {x/Tata} SUBST(θ 1,p) = P(Toto) ∧ Q(x) ⇒ R(Titi) SUBST(θ 2,p) = P(y) ∧ Q(Tata) ⇒ R(z) SUBST(COMPOSE(θ 1,θ 2),p) = P(Toto ...
Given: All cats like fish, cats eat everything they like, and Ziggy is a cat. Therefore: Ziggy eats fish Hypotheses in Horn FOL: 1. cat(x) => likes(x, Fish) 2. (cat(x) ^ likes(x,y)) => eats(x,y) 3. cat(Ziggy) Conclusion in Horn FOL: eats(Ziggy,Fish) FC GMP Proof: 4. Use GMP with 1, 3, and [x/Ziggy] to derive: likes(Ziggy,Fish) 5.
Did Curiosity kill the cat • Jack owns a dog. Every dog owner is an animal lover. No animal lover kills an animal. Either Jack or Curiosity killed the cat, who is named Tuna. Did Curiosity kill the cat? • These can be represented as follows: A. (∃x) Dog(x) ∧ Owns(Jack,x) B. (∀x) ((∃y) Dog(y) ∧ Owns(x, y)) → AnimalLover(x)
Idea: Check whether a particular fact q is true. Backward Chaining: Given a fact q to be “proven”, See if q is already in the KB. If so, return TRUE. Find all implications, I, whose conclusion “matches” q. Recursively establish the premises of all i in I via backward chaining.
The Chrysalids (United States title: Re-Birth) is a science fiction novel by British writer John Wyndham, first published in 1955 by Michael Joseph.It is the least typical of Wyndham's major novels, but regarded by some as his best. [2] [3] [4] An early manuscript version was entitled Time for a Change.[5]The novel was adapted for BBC radio by Barbara Clegg in 1982, [6] with a further ...
