Tutorial Examples Logic. March 13, 2015
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1 Tutorial Examples Logic March 13, 2015
2 English To Logic 1. Nobody likes taxes. 2. Some people like anchovies. 3. Emma is a Doberman pincher and a good dog.
3 English To Logic 1. Nobody likes taxes. X.likesTaxes(X ) X, Y.person(X ) tax(y ) likes(x, Y ) X.person(X ) Y.tax(Y ) likex(x, Y ) 2. Some people like anchovies. 3. Emma is a Doberman pincher and a good dog.
4 English To Logic 1. Nobody likes taxes. X.likesTaxes(X ) Works if every object in the in the domain is a person. X, Y.person(X ) tax(y ) likes(x, Y ) Works if we want talk about different kinds of taxes or different things that are liked. X.person(X ) ( Y.tax(Y ) likex(x, Y )) Equivalent. X, Y.person(X ) tax(y ) likes(x, Y ) X, Y. person(x ) tax(y ) likes(x, Y ) X.person(X ) ( Y. tax(y ) likes(x, Y )) X.person(X ) ( Y.tax(Y ) likes(x, Y )) 2. Some people like anchovies. 3. Emma is a Doberman pincher and a good dog.
5 English To Logic 1. Nobody likes taxes. 2. Some people like anchovies. X.person(X ) likes(x, anchovies). X, Y.person(X ) anchovy(y ) likes(x, Y ). 3. Emma is a Doberman pincher and a good dog.
6 English To Logic 1. Nobody likes taxes. 2. Some people like anchovies. 3. Emma is a Doberman pincher and a good dog. doberman(emma) good(emma).
7 Models Consider a first-order language L containing the following basic symbols: Constants, A, B, C, D. The binary predicate R. The unary predicates P and Q.
8 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. R(C, B) R(B, A)
9 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. x.p(x) Q(x).
10 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. x.p(x) y.r(y, x).
11 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. x.q(x) y.r(y, x).
12 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. x.q(x) y.r(y, x).
13 Models Let M be a model for L, with domain D = {a, b, c, d}, and interpretation function σ: 1. A σ = a, B σ = b, C σ = c, D σ = d. 2. R σ = {(b, a), (c, d)}. 3. P σ = {b, c}. 4. Q σ = {a, d}. Which of the following formulas are satisfied by M. 1. x, y.(p(x) Q(y)) R(y, x).
14 Resolution Question Consider the following sentences: 1. Marcus was a man. 2. Marcus was a Roman. 3. All men are people. 4. Caesar was a ruler. 5. All Romans were either loyal to Caesar or hated him (or both). 6. Everyone is loyal to someone. 7. People only try to assassinate rulers they are not loyal to. 8. Marcus tried to assassinate Caesar.
15 Covert to First Order Logic 1. Marcus was a man. man(marcus) 2. Marcus was a Roman. roman(marcus) 3. All men are people. X.man(X ) person(x ) 4. Caesar was a ruler. ruler(caesar) 5. All Romans were either loyal to Caesar or hated him (or both). X.roman(X ) loyal to(x, caesar) hates(x, caesar) 6. Everyone is loyal to someone. X. Y.person(Y ) loyal to(x, Y ) 7. People only try to assassinate rulers they are not loyal to. X, Y.tried to kill(x, Y ) loyal to(x, Y ) 8. Marcus tried to assassinate Caesar. tried to kill(marcus, caesar)
16 Covert to Clauses 1. man(marcus) 2. roman(marcus) 3. X.man(X ) person(x ) ( man(x ) person(x ) 4. ruler(caesar) 5. X.roman(X ) loyal to(x, caesar) hates(x, caesar) ( roman(x ) loyal to(x, caesar) hates(x, caesar)) 6. X. Y.person(Y ) loyal to(x, Y ) person(f (X )) loyal to(x, f (X )) 7. X, Y.tried to kill(x, Y ) loyal to(x, Y ) ( tried to kill(x, Y ) loyal to(x, Y )) 8. Marcus tried to assassinate Caesar. tried to kill(marcus, caesar)
17 Query 1. Who hated Caesar? 2. First order logic: Z.hates(Z, caesar) 3. Negate: Z. hates(z, caesar) 4. Clausal form. hates(z, caesar) answer(z)
18 Resolution Proof 1. man(marcus) 2. roman(marcus) 3. ( man(x ) person(x ) 4. ruler(caesar) 5. ( roman(x ) loyal to(x, caesar) hates(x, caesar)) 6. person(f (X )) 7. loyal to(x, f (X )) 8. ( tried to kill(x, Y ) loyal to(x, Y )) 9. tried to kill(marcus, caesar) 10. hates(z, caesar) answer(z) 11. R[9, 8a]{X =marcus, Y =caesar} loyal to(marcus, caesar)
19 Resolution Proof 1. man(marcus) 2. roman(marcus) 3. ( man(x ) person(x ) 4. ruler(caesar) 5. ( roman(x ) loyal to(x, caesar) hates(x, caesar)) 6. person(f (X )) 7. loyal to(x, f (X )) 8. ( tried to kill(x, Y ) loyal to(x, Y )) 9. tried to kill(marcus, caesar) 10. hates(z, caesar) answer(z) 11. R[9, 8a]{X =marcus, Y =caesar} loyal to(marcus, caesar) 12. R[11, 5c]{X =marcus} roman(marcus) hates(marcus, caesar)
20 Resolution Proof 1. man(marcus) 2. roman(marcus) 3. ( man(x ) person(x ) 4. ruler(caesar) 5. ( roman(x ) loyal to(x, caesar) hates(x, caesar)) 6. person(f (X )) 7. loyal to(x, f (X )) 8. ( tried to kill(x, Y ) loyal to(x, Y )) 9. tried to kill(marcus, caesar) 10. hates(z, caesar) answer(z) 11. R[9, 8a]{X =marcus, Y =caesar} loyal to(marcus, caesar) 12. R[11, 5c]{X =marcus} roman(marcus) hates(marcus, caesar) 13. R[12a, 2]{} hates(marcus, caesar)
21 Resolution Proof 1. man(marcus) 2. roman(marcus) 3. ( man(x ) person(x ) 4. ruler(caesar) 5. ( roman(x ) loyal to(x, caesar) hates(x, caesar)) 6. person(f (X )) 7. loyal to(x, f (X )) 8. ( tried to kill(x, Y ) loyal to(x, Y )) 9. tried to kill(marcus, caesar) 10. hates(z, caesar) answer(z) 11. R[9, 8a]{X =marcus, Y =caesar} loyal to(marcus, caesar) 12. R[11, 5c]{X =marcus} roman(marcus) hates(marcus, caesar) 13. R[12a, 2]{} hates(marcus, caesar) 14. R[13, 10]{Z = marcus} answer(marcus)
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