Select all true statements.1. If z does not occur free in B, then HB A if and only if HB (Vz)A.2. If y does not occur in A, then - (3z)A> (y)A[x :=y)-3. A[z := y|[y:= z] is always A.4.HA (Vz)A.5.F (Vz)(AV B) → (Vz)A V (Vz)B.

Answered: Select all true statements. 1. If z…

Select all true statements. 1. If z does not occur free in B, then FB→A if and only if HB→ (Vz)A. 2. If y does not occur in A, then (3z)A (y)A[z := y). 3. A[z := y[y:= z] is always A. 4.HA (Vz)A.

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

Select all true statements.
1. If z does not occur free in B, then HB A if and only if HB (Vz)A.
2. If y does not occur in A, then - (3z)A> (y)A[x :=y)-
3. A[z := y|[y:= z] is always A.
4.HA (Vz)A.
5.F (Vz)(AV B) → (Vz)A V (Vz)B.

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