Predicates S(x): x is a student D(x): x is a pet H(x): x is a home T(x, y): x is owned by y (y owns x) E(x, y): x eats at y K(x, y): x knows y L(x, y): x and y play together [Q2: Translate sentence to logic] Some pet plays with every student. Answer: [Q3: Translate sentence to logic] If a pet plays with a student at some home, then it eats at this home. Answer: [Q4: Translate formula to English] ∀x(S(x) → ∃y(D(x) ∧ L(x,y))) Answer: [Q5: Invent a Problem ]

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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Predicates

S(x): x is a student
D(x): x is a pet
H(x): x is a home
T(x, y): x is owned by y (y owns x)
E(x, y): x eats at y
K(x, y): x knows y
L(x, y): x and y play together


[Q2: Translate sentence to logic]

Some pet plays with every student.

Answer:


[Q3: Translate sentence to logic]

If a pet plays with a student at some home, then it eats at this home.

Answer:


[Q4: Translate formula to English]

∀x(S(x) → ∃y(D(x) ∧ L(x,y)))

Answer:


[Q5: Invent a Problem ]

Answer:

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