4. Consider the formulaA = Vx (p(x) →q(x)) → (Vxp(x) →xq(x)).(a) Show that A is valid.(b) Show that the converse of A is not valid.

Answer(A) : To show that A is valid, we need to show that it is a tautology, i.e., that it…

Answered: 4. Consider the formula A = Vx (p(x)…

4. Consider the formula A = Vx (p(x) →q(x)) → (Vxp(x) →Vaq(x)). (a) Show that A is valid. (b) Show that the converse of A is not valid.

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

4. Consider the formula
A = Vx (p(x) →q(x)) → (Vxp(x) →xq(x)).
(a) Show that A is valid.
(b) Show that the converse of A is not valid.

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