2. Consider the set AP = { A, B } of atomic propositions. Formulate the following properties as LT properties and characterize each of them as being either an invariance, safety property, or liveness property, or none of these. (a) A should never occur, (b) A should occur exactly once, (c) A and B alternate infinitely often, (d) A should eventually be followed by B.

2. Consider the set AP = { A, B } of atomic propositions. Formulate the following properties as LT properties and characterize each of them as being either an invariance, safety property, or liveness property, or none of these. (a) A should never occur, (b) A should occur exactly once, (c) A and B alternate infinitely often, (d) A should eventually be followed by B.

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

2.
Consider the set AP = { A. B } of atomic propositions. Formulate the following
properties as LT properties and characterize each of them as being either an invariance,
safety property, or liveness property, or none of these.
(a) A should never occur,
(b) A should occur exactly once,
(c) A and B alternate infinitely often,
(d) A should eventually be followed by B.

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