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Which of the following sequences of symbols are well-formed formulas (wffs)? Put an ‘x’ or a ‘√’ after each sequence. Or put ‘yes’ or ‘no’ after each sequence.     1. 5 + 10 = 15  2. A & ~ B logically implies ~B  3. ~ ~ ~ A & ~ ~  A 4. ~ ( Z ⊃ (Z v Z)) 5. (A ⊃ B) v (C ≡ D) & ((E v F) ⊃ G) 6. A ⊃ (⊃ E v D) 7. A ⊃  (~A & ~ A) 8. ~A ⊃ (A v A) 9. A ⊃  A ~A 10. A ⊃ ~BB

Which of the following sequences of symbols are well-formed formulas (wffs)? Put an ‘x’ or a ‘√’ after each sequence. Or put ‘yes’ or ‘no’ after each sequence.     1. 5 + 10 = 15  2. A & ~ B logically implies ~B  3. ~ ~ ~ A & ~ ~  A 4. ~ ( Z ⊃ (Z v Z)) 5. (A ⊃ B) v (C ≡ D) & ((E v F) ⊃ G) 6. A ⊃ (⊃ E v D) 7. A ⊃  (~A & ~ A) 8. ~A ⊃ (A v A) 9. A ⊃  A ~A 10. A ⊃ ~BB

Advanced Engineering Mathematics
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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Which of the following sequences of symbols are well-formed formulas (wffs)?

Put an ‘x’ or a ‘√’ after each sequence. Or put ‘yes’ or ‘no’ after each sequence.

 

 

1. 5 + 10 = 15 

2. A & ~ B logically implies ~B 

3. ~ ~ ~ A & ~ ~  A

4. ~ ( Z ⊃ (Z v Z))

5. (A ⊃ B) v (C ≡ D) & ((E v F) ⊃ G)

6. A ⊃ (⊃ E v D)

7. A ⊃  (~A & ~ A)

8. ~A ⊃ (A v A)

9. A ⊃  A ~A

10. A ⊃ ~BB

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