# Homework Assignment 7 Solution

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## Description

• Read Myhill-Nerode handout in the ecommons resources folder.

• Use the Myhill-Nerode Theorem to prove that the languages in Exercise 1.29 (a and c), page 88 and Problem 1.46 (b and c) page 90, are not regular.

• Prove any language of your choice is regular with the Myhill-Nerode theorem. Could you have done the proof (of regularity) with the Pumping Lemma?

• Read chapter 2 of the book at least through page 105 2nd ed, 107 3rd ed.

• Exercises 2.3 and 2.4, page 128 2nd ed, 155 3rd ed.

• Give a CFG for the language {X {A, B} | X = WW for some W {A, B}}.

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