Exercises. Prove the following: 1. A ∧ (B ∧ C) ⊢ C 2. A ∧ (B → C), A → B ⊢ C 3. A ∧ (B ∧ C) ⊢ (A ∧ B) ∧ C 4. A, A → B ⊢ A ∧ B 5. A ∧ B, B → C ⊢ A ∧ (B ∧ C) 6. A → B ∧ C, A ∧ D ⊢ B ∧ C 7. A → C ⊢ A ∧ B → C ∧ B 8. A ∧ B → C ⊢ A → (B → C

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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• Exercises. Prove the following:

1. A ∧ (B ∧ C) ⊢ C

2. A ∧ (B → C), A → B ⊢ C

3. A ∧ (B ∧ C) ⊢ (A ∧ B) ∧ C

4. A, A → B ⊢ A ∧ B

5. A ∧ B, B → C ⊢ A ∧ (B ∧ C)

6. A → B ∧ C, A ∧ D ⊢ B ∧ C

7. A → C ⊢ A ∧ B → C ∧ B

8. A ∧ B → C ⊢ A → (B → C)

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