1. Suppose we are in the middle of a proof and our current goal is: S(c)→(∀d)(M(d)→R(d,c)) Suppose the next line of the proof is "Assume S(c)." Which of the following does the goal change to? (∀d)(M(d)→R(d,c)) S(c)→(∀d)(M(d)→R(d,c)) M(d)→R(d,c) S(c)→M(c)
1. Suppose we are in the middle of a proof and our current goal is: S(c)→(∀d)(M(d)→R(d,c)) Suppose the next line of the proof is "Assume S(c)." Which of the following does the goal change to? (∀d)(M(d)→R(d,c)) S(c)→(∀d)(M(d)→R(d,c)) M(d)→R(d,c) S(c)→M(c)
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
Problem 1PE
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Question
1. Suppose we are in the middle of a proof and our current goal is:
S(c)→(∀d)(M(d)→R(d,c))
Suppose the next line of the proof is "Assume S(c)." Which of the following does the goal change to?
(∀d)(M(d)→R(d,c))
S(c)→(∀d)(M(d)→R(d,c))
M(d)→R(d,c)
S(c)→M(c)
2. Suppose we are in the middle of a proof and our current goal is:
(∀d)(R(d,c)→R(c,d))
Suppose the next line of the proof is "Let d be an arbitrary (whatever its type is)." Which of the following does the goal change to?
Group of answer choices
R(d,c)→R(c,d)
(∀d)(R(d,c)→R(c,d))
R(d,c)
R(c,d)
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