Question: 4. Let R, S and T be arbitrary regular expressions. For each of the following assertions, state whether it is true or false, and justify

4. Let R, S and T be arbitrary regular expressions. For

4. Let R, S and T be arbitrary regular expressions. For each of the following assertions, state whether it is true or false, and justify your answer. (a) If RS SR then RE S. b) If RSRT and R 0 then S T (c) (RS+R) RE R(SR+R)

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