Use only the inference rules MP, MT, DS and HS for this quiz. For each proof, you must include (i.e., write) the premises in that proof.
Use only the inference rules MP, MT, DS and HS for this quiz. For each proof, you must include (i.e., write) the premises in that proof.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
Use only the inference rules MP, MT, DS and HS for this quiz. For each proof, you must include (i.e., write) the premises in that proof. Proofs without premises will lead to points being lost. YOU CANNOT USE CONDITIONAL PROOF (CP), INDIRECT PROOF (IP), OR ASSUMED PREMISES (AP). You will lose points if you use any of the inference rules Resolution, Contradiction, Transposition, Idempotence and Identity.

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### Logical Proof Exercises
The following exercises provide practice in constructing logical proofs. For each set of premises, prove the given conclusion.
#### Exercise 1
- **Premises:**
1. \( C \supset (\sim D \supset \sim X) \)
2. \( C \)
- **Conclusion:**
3. \( X \)
**Goal:** Prove \( D \)
**Note:** /D means to prove D.
---
#### Exercise 2
- **Premises:**
1. \( A \supset \sim B \)
2. \( B \)
- **Conclusion:**
3. \( \sim A \supset (C \lor \sim B) \)
**Goal:** Prove \( C \)
---
#### Exercise 3
- **Premises:**
1. \( A \supset \sim D \)
- **Conclusion:**
2. \( \sim D \supset (\sim B \lor \sim \sim A) \)
3. \( A \)
4. \( B \)
**Goal:** Prove \( \sim \sim A \)
---
These exercises involve using logical connectives such as implication (\(\supset\)), negation (\(\sim\)), and disjunction (\(\lor\)). Work through each proof step by step to arrive at the desired conclusion.
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