Answered: Q4. Let zand y be propositional…

Q4. Let zand y be propositional variables. Which of the following propositions is not a tautology? A.1 → 1 B. (r→y) V (y→x) C.-(x^-x) D. y → (IV-x) EIIA F. (y^¬y) → I

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

Section: Chapter Questions

Problem 1PE

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Question

Q4. Letr and y be propositional variables. Which of the following propositions is not a
tautology?
A. x→ I
B. (x→y) V (y →x)
C. -(x^-x)
D. y → (TV-x)
E. x→→x
F. (y^-y) → x

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