Consider the Hilbert-Ackerman (H-A) Axioms: 1.A VA - A 2.A AVB 3.A V B - BVA 4.(A → B) → (C V A CV B) Proof rules: MP and AB = -A Vv B Is the following proof of the given wff correct? -A - (A → B) Proof: 1.¬A (¬A V B) 2.¬A (A B) QED

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Question 18.
Consider the Hilbert-Ackerman (H-A) Axioms:
1.A VA - A
2.A → AVB
3.A V B → BV A
4.(A → B) → (C V A CV B)
Proof rules: MP and A → B = -A V B
Is the following proof of the given wff correct?
-A → (A → B)
Proof:
1.¬A → (¬A V B)
2.¬A → (A → B)
QED
True
False
No idea
Where am I?
Transcribed Image Text:Question 18. Consider the Hilbert-Ackerman (H-A) Axioms: 1.A VA - A 2.A → AVB 3.A V B → BV A 4.(A → B) → (C V A CV B) Proof rules: MP and A → B = -A V B Is the following proof of the given wff correct? -A → (A → B) Proof: 1.¬A → (¬A V B) 2.¬A → (A → B) QED True False No idea Where am I?
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