Use the rules of inference from the lecture notes (together with basic logical equivalences if needed) to show that the following argument is valid. Name the rule you use at each step. B→A A∨D A → ¬D E → ¬A B —————– ∴ ¬E

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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Use the rules of inference from the lecture notes (together with basic logical equivalences if needed) to show that the following argument is valid. Name the rule you use at each step.
B→A

A∨D
A → ¬D
E → ¬A
B —————– ∴ ¬E 

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