Consider a vocabulary with the following symbols: > Occupation(p,o): Predicate. Person p has occupation o. > Customer(p1,p2): Predicate. Person p1 is a customer of person p2. > Boss(p1,p2): Predicate. Person p1 is a boss of person p2. > Doctor, Surgeon, Lawyer, Actor: Constants denoting occupations. > Emily, Joe: Constants denoting people. Use these symbols to write the following assertions in first-order logic: 1. Emily is either a surgeon or a lawyer. 2. Joe is an actor, but he also holds another job. 3. All surgeons are doctors. 4. Joe does not have a lawyer (i.e., is not a customer of any lawyer). 5. Emily has a boss who is a lawyer. 6. There exists a lawyer all of whose customers are doctors. 7. Every surgeon has a lawyer.
Consider a vocabulary with the following symbols:
> Occupation(p,o): Predicate. Person p has occupation o. > Customer(p1,p2): Predicate. Person p1 is a customer of person p2. > Boss(p1,p2): Predicate. Person p1 is a boss of person p2. > Doctor, Surgeon, Lawyer, Actor: Constants denoting occupations. > Emily, Joe: Constants denoting people. Use these symbols to write the following assertions in first-order logic:
1. Emily is either a surgeon or a lawyer.
2. Joe is an actor, but he also holds another job.
3. All surgeons are doctors.
4. Joe does not have a lawyer (i.e., is not a customer of any lawyer).
5. Emily has a boss who is a lawyer.
6. There exists a lawyer all of whose customers are doctors.
7. Every surgeon has a lawyer.
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