Let L1, L2, and L3 be languages over some alphabet. In each case below, two languages are given. Saywhat the relationship is between them. (Are they always equal? If not, is one always a subset of theother?) Give reasons for your answers, including counterexamples if appropriate.LL, (L,L2)*

Let L1, L2,and L3 be languages over some alphabet Σ. In each case below, two languages are given.

Answered: Let L1, L2, and L3 be languages over…

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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Give a recursive definition for the set of all strings of a’s and b’s that begins with an a and ends in a b. Say, S = { ab, aab, abb, aaab, aabb, abbb, abab..} Let S be the set of all strings of a’s and b’s that begins with a and ends in a b. The recursive definition is as follows – Base:... Recursion: If u ∈ S, then... Restriction: There are no elements of S other than those obtained from the base and recursion of S.
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Let L1, L2, and L3 be languages over some alphabet. In each case below, two languages are given. Say what the relationship is between them. (Are they always equal? If not, is one always a subset of the other?) Give reasons for your answers, including counterexamples if appropriate. L¡L;, (L,L2)*