Given a nonempty language A⊂∑*, prove that if A2 = A, then λ ∈ A.

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Given a nonempty language A⊂∑*, prove that if A2 = A, then λ ∈ A.
Related Book For answer-question

Discrete and Combinatorial Mathematics An Applied Introduction

5th edition

Authors: Ralph P. Grimaldi

ISBN: 978-0201726343