The following set of sentences is probably inconsistent.  (P → ← Q), (P → Q), (P ∧ R)  (b) Using any of the proof rules (from Ch. 16 & 18 of the text) in the natural  deduction system, complete the proof that shows that set of sentences is  provably inconsistent.

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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The following set of sentences is probably inconsistent. 

(→ ← Q), (→ Q), (∧ R

(b) Using any of the proof rules (from Ch. 16 & 18 of the text) in the natural  deduction system, complete the proof that shows that set of sentences is  provably inconsistent.  

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