19) Using truth-tables, check the veracity of the following statement: ((r→ t) V (s A-t)) A (t Vr)) is not equivalent to ((-r Vt) V (s A-t)) A (t V r)) 20) Using truth-tables, check the veracity of the following statement: ((r t) V (s A-t)) A (t Vr)) is equivalent to ((-r V t) V (s A-t)) A (t Vr)) [T/F] c) Distributive Law d) Absorption Law [T/F] 21) Answer the following question by selection the appropriate supporting evidence for each logical equivalence: (rs) ^ (q→r) = (q→r) A (rs) a) De Morgan's Law b) Commutative Law

19) Using truth-tables, check the veracity of the following statement: ((r→ t) V (s A-t)) A (t Vr)) is not equivalent to ((-r Vt) V (s A-t)) A (t V r)) 20) Using truth-tables, check the veracity of the following statement: ((r t) V (s A-t)) A (t Vr)) is equivalent to ((-r V t) V (s A-t)) A (t Vr)) [T/F] c) Distributive Law d) Absorption Law [T/F] 21) Answer the following question by selection the appropriate supporting evidence for each logical equivalence: (rs) ^ (q→r) = (q→r) A (rs) a) De Morgan's Law b) Commutative Law

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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19) Using truth-tables, check the veracity of the following statement:
((rt) V (s A-t)) A (t Vr)) is not equivalent to ((-r V t) V (s A-t)) ^ (t Vr))
20) Using truth-tables, check the veracity of the following statement:
((rt) V (s A-t)) A (t Vr)) is equivalent to ((-r Vt) V (s A-t)) ^ (t Vr))
[T/F]
[T/F]
21) Answer the following question by selection the appropriate supporting evidence for each logical
equivalence:
(rs) A (q→r) = (q→r) A (r→s)
a) De Morgan's Law
b) Commutative Law
c) Distributive Law
d) Absorption Law

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